Show related posts before "GP Social Share" in Blog posts only

Hi
following some question in this forum, im adding a "related posts" snippet to posts using the code shown here:

https://www.hongkiat.com/blog/wordpress-related-posts-without-plugins/

add_action( 'generate_after_main_content','show_related_posts', 5 );  
function show_related_posts() { ?> 

		<div class="relatedposts">
		<h3>Related posts</h3>
		<?php
		  $orig_post = $post;
		  global $post;
		  $tags = wp_get_post_tags($post->ID);
		   
		  if ($tags) {
				  $tag_ids = array();
				  foreach($tags as $individual_tag) $tag_ids[] = $individual_tag->term_id;
					  $args=array(
					  'tag__in' => $tag_ids,
					  'post__not_in' => array($post->ID),
					  'posts_per_page'=>4, // Number of related posts to display.
					  'caller_get_posts'=>1
				  );
				   
				  $my_query = new wp_query( $args );
				 
				  while( $my_query->have_posts() ) {
				 	 	$my_query->the_post();
				  ?>
				   
				  <div class="relatedthumb">
				    <a rel="nofollow" target="_blank" href="<? the_permalink()?>"><?php the_post_thumbnail(array(150,100)); ?><br />
				    <?php the_title(); ?>
				    </a>
				  </div>
				   
				  <? }
		  }
		  $post = $orig_post;
		  wp_reset_query();
		  ?>
		</div>

<?php }

1. Its currently showing last in the <footer class="entry-meta"></div> wrapper,
How can i make it show first ? (tried priority 5, its not helping), should i use a different hook ?

2. what hook should i use to show it on posts only (not on pages) ?

Thanks