Related post in wp show posts in generatepress theme

Hello,

I have found that code to display wp show posts pro as a related posts in my single post page.

<div class="wpsp-related-posts1  grid-container">
	<h2>Related Posts</h2>
<?php    
if ( is_single() ) {
        $tags =  get_the_tags();
        $tags_list = [];
        foreach ($tags as $tag)
            $tags_list[] = $tag->slug;
        $tag_string = implode( ', ', $tags_list);
    } else {
        $tag_string = get_tag( get_query_var( 'tag' ) );
    }

    $list = get_page_by_title( 'related', 'OBJECT', 'wp_show_posts' );
    wpsp_display( $list->ID, 'tax_term="' . $tag_string . '"' );
    ?>
</div>

But it doesnt work, can you please help. I am adding this code a hook, after the content in elements.

I just want to display related posts by tags, in my specified place under the single posts content, before footer.

Please let me know.

Thank you so much!