comment-link-after-post.php

<?php
/*
 * Plugin Name: Comment Link After Post
 * Plugin URI: https://www.nosegraze.com/questions/comment-link-below-post/
 * Description: Adds a link to the comment area below the post.
 * Version: 1.0
 * Author: Nose Graze
 * Author URI: http://www.nosegraze.com
 * License: GPL2
 * License URI: http://www.gnu.org/licenses/gpl-2.0.txt
 * Text Domain: comment-link-after-post
 * Domain Path: /languages
 *
 * @package comment-link-after-post
 * @copyright Copyright (c) 2015, Ashley Evans
 * @license   GPL2+
*/

/**
 * Adds a comment link after the post content.
 * 
 * @return string
 */
function comment_link_after_post( $content ) {
    ob_start();
    ?>
    <div class="comment-link-after-post">
        <a href="<?php comments_link(); ?>">Click here to leave a comment!</a>
    </div>
    <?php
    
    return $content . ob_get_clean();
}

// You can change the number 10 to adjust the priority (when this gets added to the content).
add_filter( 'the_content', 'comment_link_after_post', 10 );