Not Displaying Related Posts

Does not display related posts.

add_action( 'astra_entry_bottom','callback_function_name' );
function callback_function_name () { ?>
	<?php if( is_single() || is_page() ) { ?>

            <?php if ( function_exists( 'echo_crp' ) ) { echo_crp(); } ?>
					
	<?php } ?>
		
<?php }

The page I need help with: [log in to see the link]