Try adding "Stewart", a light blogging theme with a sidebar

stewart/functions.php

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+<?php
+
+/**
+ * Sets up theme defaults and registers support for various WordPress features.
+ */
+function stewart_support() {
+
+	// Add support for block styles.
+	add_theme_support( 'wp-block-styles' );
+
+	// Enqueue editor styles.
+	add_editor_style( 
+		array(
+			stewart_fonts_url(),
+			'style.css',
+		)
+	);
+}
+add_action( 'after_setup_theme', 'stewart_support' );
+
+
+/**
+ * Enqueue styles.
+ */
+function stewart_styles() {
+
+	// Register theme stylesheet.
+	wp_register_style(
+		'stewart-style',
+		get_stylesheet_directory_uri() . '/style.css',
+		array(),
+		wp_get_theme()->get( 'Version' )
+	);
+
+	// Enqueue theme stylesheet.
+	wp_enqueue_style( 'stewart-style' );
+
+	// Enqueue Google fonts
+	wp_enqueue_style( 'seedlet-fonts', stewart_fonts_url(), array(), null );
+}
+add_action( 'wp_enqueue_scripts', 'stewart_styles' );
+
+
+/**
+ * Add Google webfonts, if necessary
+ *
+ * - See: http://themeshaper.com/2014/08/13/how-to-add-google-fonts-to-wordpress-themes/
+ */
+function stewart_fonts_url() {
+
+	$fonts_url = '';
+
+	/* Translators: If there are characters in your language that are not
+	* supported by Work Sans, translate this to 'off'. Do not translate
+	* into your own language.
+	*/
+	$work_sans = esc_html_x( 'on', 'Work Sans: on or off', 'stewart' );
+
+	if ( 'off' !== $work_sans ) {
+		$font_families = 'Work+Sans:ital,wght@0,400;0,700;1,400;1,700';
+
+		$query_args = array(
+			'family' => $font_families,
+			'subset' => 'latin,latin-ext',
+		);
+
+		$fonts_url = add_query_arg( $query_args, 'https://fonts.googleapis.com/css' );
+	}
+
+	return esc_url_raw( $fonts_url );
+}

stewart/index.php

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+<?php
+// There is nothing output here because block themes do not use php templates.
+// There is a core ticket discussing removing this requirement for block themes:
+// https://core.trac.wordpress.org/ticket/54272.
+

stewart/parts/footer.html

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+<!-- wp:spacer {"height":60} -->
+<div style="height:60px" aria-hidden="true" class="wp-block-spacer"></div>
+<!-- /wp:spacer -->
+
+<!-- wp:group -->
+<div class="wp-block-group">
+	<!-- wp:paragraph {"align":"center","fontSize":"tiny"} -->
+	<p class="has-text-align-center has-tiny-font-size">Proudly Powered by <a href="https://wordpress.org" rel="nofollow">WordPress</a></p>
+	<!-- /wp:paragraph -->
+</div>
+<!-- /wp:group -->
+
+<!-- wp:spacer {"height":60} -->
+<div style="height:60px" aria-hidden="true" class="wp-block-spacer"></div>
+<!-- /wp:spacer -->

stewart/parts/header-spacer.html

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+<!-- wp:spacer {"height":70} -->
+<div style="height:70px" aria-hidden="true" class="wp-block-spacer"></div>
+<!-- /wp:spacer -->

stewart/parts/header.html

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+<!-- wp:group {"align":"full","layout":{"type":"flex","justifyContent":"space-between"},"style":{"spacing":{"padding":{"top":"var(--wp--custom--margin--horizontal, 30px)","bottom":"40px"}}}} -->
+<div class="wp-block-group alignfull" style="padding-top:var(--wp--custom--margin--horizontal, 30px);padding-bottom:40px">
+	<!-- wp:site-title /-->
+	<!-- wp:navigation {"isResponsive":true,"__unstableLocation":"primary"} /-->
+</div>
+<!-- /wp:group -->

stewart/parts/sidebar.html

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+<!-- wp:group -->
+<div class="wp-block-group"><!-- wp:site-logo {"width":90,"className":"is-style-rounded"} /-->
+
+<!-- wp:site-title {"fontSize":"gigantic","style":{"typography":{"lineHeight":"1.2"}}} /-->
+
+<!-- wp:site-tagline {"fontSize":"small"} /-->
+
+<!-- wp:separator {"className":"is-style-wide"} -->
+<hr class="wp-block-separator is-style-wide"/>
+<!-- /wp:separator -->
+
+<!-- wp:spacer {"height":1} -->
+<div style="height:1px" aria-hidden="true" class="wp-block-spacer"></div>
+<!-- /wp:spacer -->
+
+<!-- wp:navigation {"layout":{"type":"flex","setCascadingProperties":true,"justifyContent":"left","orientation":"vertical"},"style":{"spacing":{"blockGap":"0px"}}} -->
+<!-- wp:page-list {"isNavigationChild":true,"showSubmenuIcon":true,"openSubmenusOnClick":false} /-->
+<!-- /wp:navigation -->
+
+<!-- wp:separator {"className":"is-style-wide"} -->
+<hr class="wp-block-separator is-style-wide"/>
+<!-- /wp:separator -->
+
+<!-- wp:social-links {"iconColor":"foreground","iconColorValue":"var(--wp--preset--color--foreground)","className":"items-justified-left is-style-logos-only"} -->
+<ul class="wp-block-social-links has-icon-color items-justified-left is-style-logos-only"><!-- wp:social-link {"url":"#","service":"twitter"} /-->
+
+<!-- wp:social-link {"url":"#","service":"facebook"} /-->
+
+<!-- wp:social-link {"url":"#","service":"instagram"} /--></ul>
+<!-- /wp:social-links --></div>
+<!-- /wp:group -->
+
+<!-- wp:spacer {"height":80} -->
+<div style="height:80px" aria-hidden="true" class="wp-block-spacer"></div>
+<!-- /wp:spacer -->

stewart/readme.txt

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+=== Stewart ===
+Contributors: automattic
+Requires at least: 5.8
+Tested up to: 5.9
+Requires PHP: 5.6
+Stable tag: 1.0
+License: GPLv2 or later
+License URI: http://www.gnu.org/licenses/gpl-2.0.html
+
+== Description ==
+
+A simple theme for blogging.
+
+== Changelog ==
+
+= 1.0 =
+* Released: December
+
+== Copyright ==
+
+Stewart WordPress Theme, (C) 2021 Automattic, Inc.
+Stewart is distributed under the terms of the GNU GPL.
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+This theme uses the following third-party resource in its theme screenshot:
+
+"Swedish Windows / Fönster no. 1" by Fons Heijnsbroek
+https://www.flickr.com/photos/abstract-art-fons/28822761186/

stewart/style.css

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+/*
+Theme Name: Stewart
+Theme URI: https://github.com/Automattic/themes/tree/trunk/stewart
+Author: Automattic
+Author URI: https://automattic.com/
+Description: A simple theme for blogging.
+Requires at least: 5.7
+Tested up to: 5.9
+Requires PHP: 5.7
+Version: 1.0
+License: GNU General Public License v2 or later
+License URI: http://www.gnu.org/licenses/gpl-2.0.html
+Text Domain: stewart
+Tags: block-styles, custom-colors, custom-menu, custom-logo, editor-style, featured-images, full-site-editing, rtl-language-support, theme-options, threaded-comments, translation-ready, wide-blocks
+
+Stewart WordPress Theme, (C) 2021 Automattic, Inc.
+Stewart is distributed under the terms of the GNU GPL.
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+This theme uses the following third-party resource in its theme screenshot:
+
+"Swedish Windows / Fönster no. 1" by Fons Heijnsbroek
+https://www.flickr.com/photos/abstract-art-fons/28822761186/
+
+*/
+
+/*
+ * Font smoothing.
+ * This is a niche setting that will not be available via Global Styles.
+ * https://github.com/WordPress/gutenberg/issues/35934
+ */
+
+body {
+	-moz-osx-font-smoothing: grayscale;
+	-webkit-font-smoothing: antialiased;
+}
+
+/*
+ * Link Details
+ */
+
+a {
+	text-decoration-thickness: 0.075ex;
+	text-underline-offset: 0.125em;
+}
+
+.wp-block-site-title a {
+	text-decoration: none;
+}
+
+a:hover,
+.wp-block-site-title a:hover,
+.wp-block-post-title a:hover,
+.wp-block-post-date a:hover {
+	color: var(--wp--preset--color--primary);
+}
+
+.wp-block-navigation .wp-block-navigation-link a,
+.wp-block-navigation .wp-block-page-list a,
+.wp-block-navigation .wp-block-pages-list__item a,
+.wp-block-navigation .wp-block-post-title a {
+	text-decoration: underline;
+}
+
+.wp-block-navigation .wp-block-navigation-link a:hover,
+.wp-block-navigation .wp-block-page-list a:hover,
+.wp-block-navigation .wp-block-pages-list__item a:hover,
+.wp-block-navigation .wp-block-post-title a:hover {
+	color: var(--wp--preset--color--primary);
+	text-decoration: none;
+}
+
+/*
+ * Button hover styles.
+ * Necessary until the following issue is resolved in Gutenberg:
+ * https://github.com/WordPress/gutenberg/issues/27075
+ */
+
+.wp-block-search__button:hover,
+.wp-block-file .wp-block-file__button:hover,
+.wp-block-button__link:hover {
+	opacity: 0.90;
+} 
+
+/*
+ * Search and File Block button styles.
+ * Necessary until the following issues are resolved in Gutenberg:
+ * https://github.com/WordPress/gutenberg/issues/36444
+ * https://github.com/WordPress/gutenberg/issues/27760
+ */
+
+.wp-block-search__button,
+.wp-block-file .wp-block-file__button {
+	background-color: var(--wp--preset--color--primary);
+	border-radius: 0;
+	border: none;
+	color: var(--wp--preset--color--background);
+	font-size: var(--wp--preset--typography--font-size--normal);
+	padding: calc(.667em + 2px) calc(1.333em + 2px);
+}
+
+/*
+ * Comment Form Fields
+ */
+
+.wp-block-post-comments input:not([type=submit]),
+.wp-block-post-comments textarea {
+	background-color: var(--wp--preset--color--background);
+	border-color: var(--wp--preset--color--foreground);
+}

stewart/templates/archive.html

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+<!-- wp:template-part {"slug":"header-spacer","tagName":"header"} /-->
+
+<!-- wp:group {"align":"wide","layout":{"inherit":true}} -->
+<div class="wp-block-group alignwide"><!-- wp:columns {"align":"wide"} -->
+<div class="wp-block-columns alignwide"><!-- wp:column {"width":"30%"} -->
+<div class="wp-block-column" style="flex-basis:30%"><!-- wp:template-part {"slug":"sidebar","tagName":"aside"} /--></div>
+<!-- /wp:column -->
+
+<!-- wp:column {"width":"70%","style":{"spacing":{"padding":{"top":"0px","right":"0px","bottom":"0px","left":"0px"}}}} -->
+<div class="wp-block-column" style="padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;flex-basis:70%"><!-- wp:group {"tagName":"main"} -->
+<main class="wp-block-group"><!-- wp:query-title {"type":"archive","fontSize":"huge"} /-->
+
+<!-- wp:spacer {"height":30} -->
+<div style="height:30px" aria-hidden="true" class="wp-block-spacer"></div>
+<!-- /wp:spacer -->
+
+<!-- wp:query {"query":{"perPage":10,"pages":0,"offset":0,"postType":"post","categoryIds":[],"tagIds":[],"order":"desc","orderBy":"date","author":"","search":"","exclude":[],"sticky":"","inherit":false},"displayLayout":{"type":"list","columns":2}} -->
+<div class="wp-block-query"><!-- wp:post-template -->
+<!-- wp:post-title {"isLink":true,"fontSize":"huge","style":{"typography":{"lineHeight":"1.2"}}} /-->
+
+<!-- wp:post-featured-image {"isLink":true} /-->
+
+<!-- wp:post-excerpt {"fontSize":"normal"} /-->
+
+<!-- wp:post-date {"isLink":true,"fontSize":"extra-small"} /-->
+
+<!-- wp:spacer {"height":60} -->
+<div style="height:60px" aria-hidden="true" class="wp-block-spacer"></div>
+<!-- /wp:spacer -->
+<!-- /wp:post-template -->
+
+<!-- wp:query-pagination -->
+<div class="wp-block-query-pagination"><!-- wp:query-pagination-previous /-->
+
+<!-- wp:query-pagination-numbers /-->
+
+<!-- wp:query-pagination-next /--></div>
+<!-- /wp:query-pagination --></div>
+<!-- /wp:query --></main>
+<!-- /wp:group --></div>
+<!-- /wp:column --></div>
+<!-- /wp:columns --></div>
+<!-- /wp:group -->
+
+<!-- wp:template-part {"slug":"footer","tagName":"footer","layout":{"inherit":true}} /-->

stewart/templates/blank.html

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+<!-- wp:post-content {"layout":{"inherit":true}} /-->

stewart/templates/header-footer-only.html

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+<!-- wp:template-part {"slug":"header","tagName":"header"} /-->
+
+<!-- wp:group {"tagName":"main"} -->
+<main class="wp-block-group">
+
+<!-- wp:post-content {"layout":{"inherit":true}} /-->
+</main>
+<!-- /wp:group -->
+
+<!-- wp:template-part {"slug":"footer","tagName":"footer","layout":{"inherit":true}} /-->