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Hi there,

1. You will need to add the following PHP Snippet to your site:

function db_custom_loop_shortcode($atts, $content = null) {
    global $post;
    // Set query args
    $args = array(
        'post_type' => 'post',
        'posts_per_page' => '3',
        'post__not_in' => array( $post->ID ), // don't display current post
    );
    // Optional arguments for setting category term relationship on single post
    if ( is_single() && has_category() ) {  
        $category = get_the_category($post->ID);
        $category_id = $category[0]->cat_ID;
        $category_count = $category[0]->count;
        if ( $category_count > 1 ) {
            $args['category__in'] = array($category_id);
        }
    } 
    $latest = new WP_Query($args);
    // Output loop
    if ( $latest->have_posts() ) {
        ob_start();
        echo '<div class="gb-grid-wrapper gb-grid-wrapper-global">';     
        while ($latest->have_posts()) : $latest->the_post();
            echo '<div class="gb-grid-column gb-grid-column-global-33">';
            do_action('db_custom_post_loop'); // Hook name for content template
            echo '</div>';
        endwhile;
        echo '</div>';
        wp_reset_postdata();
        return ob_get_clean();
    }
}
add_shortcode('db_display_custom_post_loop', 'db_custom_loop_shortcode');

add_action('generate_after_content', function(){
if ( is_single() ) {
echo do_shortcode('db_display_custom_post_loop');
}
});
`

This doc explains how to add PHP:

https://docs.generatepress.com/article/adding-php/

2. in Dashboard > Appearance > Elements create a new Block Element - Content Template.

https://docs.generatepress.com/article/block-element-content-template/

Use one of the templates or design your own post card.

Then change the Element Type to Hook
In the Hook list select: Custom Hook
And in the Hook field add: db_custom_post_loop

Set the Display Rules to Posts > All Posts.