Custom Related Posts in Genesis Framework https://rainastudio.com/custom-related-posts-genesis/

related-posts.php

<?php
// Do NOT include opening tag

/**
 * Related Popular Posts.
 *
 * @package      StudioPlayer
 * @link         https://rainastudio.com/themes/studioplayer
 * @author       RainaStudio
 * @copyright    Copyright © 2018 RainaStudio
 * @license      GPL-2.0+
 */

function studio_player_related_posts_setup($args = array()) {
	if ( is_singular('post') ) {
		?>
		<div class="related-posts">
			<h4 class="widget-title">Related Popular Posts</h4><?php
		
			global $post;

			// Default args
			$args = wp_parse_args($args, array(
				'post_id'		 => !empty($post) ? $post->ID : '', // Exclude current post
				'taxonomy'		 => 'category', // Show posts by category
				'limit'			 => 3, // How many items to display
				'post_type'		 => !empty($post) ? $post->post_type : 'post',
				'orderby'		 => 'rand', // Randomize the results
				'order'			 => 'DESC'
			));

			// Check taxonomy
			if (!taxonomy_exists($args['taxonomy'])) {
				return;
			}

			// Post taxonomies
			$taxonomies = wp_get_post_terms($args['post_id'], $args['taxonomy'], array('fields' => 'ids'));

			if (empty($taxonomies)) {
				return;
			}

			// Custom post query
			$related_posts = get_posts(array(
				'post__not_in' => (array) $args['post_id'],
				'post_type' => $args['post_type'],
				'tax_query' => array(
					array(
						'taxonomy' => $args['taxonomy'],
						'field' => 'term_id',
						'terms' => $taxonomies
					),
				),
				'posts_per_page' => $args['limit'],
				'orderby' => $args['orderby'],
				'order' => $args['order']
			));
			
			// Layout the loop
			if (!empty($related_posts)) { ?>
				<div class="related-posts-wrap">
					<ul class="related-posts-list">
						<?php
						foreach ($related_posts as $post) {
							setup_postdata($post);
						?>
						<li>
							<a class="title" href="<?php the_permalink(); ?>" title="<?php the_title_attribute(); ?>">
								<?php if (has_post_thumbnail()) { ?>
								<div class="thumb">
									<?php echo get_the_post_thumbnail(null, 'medium', array('alt' => the_title_attribute(array('echo' => false)))); ?>
								</div>
								<?php } ?>
								<p class="title"><?php the_title(); ?></p>
							</a>
						</li>
						<?php } ?>
					</ul>
					<div class="clearfix"></div>
				</div>
			<?php
			}
			wp_reset_postdata();
		?></div><?php

	}
}

add_action( 'genesis_after_entry', 'studio_player_related_posts_setup', 5 );