problem with custom url to the featured image

I have used a wordpress plugin (Add Featured Image Custom Link) to insert custom url to the featured image.

I have two functionalities in my portfolio:

1. when the user click on image it will popup the image; this is working properly.
2. the anchor tag I have used for the link which I have added to featured image I want to redirect to the website of which I have added the link on featured image

How do I do #2

<div class="option inner">
  <div>
    <h5><?php the_title(); ?></h5>
    <?php
      $url = get_the_post_thumbnail_url(get_the_ID(),'full');
    ?> 
    <a href="<?php echo $url; ?>" class="fa fa-search mfp-image"></a>
    <a href="" class="fa fa-link"></a>
  </div>
</div>

Read more here: https://stackoverflow.com/questions/65704493/problem-with-custom-url-to-the-featured-image