how do i make this loop work

Apologies I am a PHp beginner and I have no idea why this loop is not working on my tag.php page any help would be welcome.

<?php get_header(); ?>
<div class="posts"><!-- BLOG -->

    <!-- Shapes on sides -->
    <div class="shapes_left"> </div>
    <div class="shapes_right"> </div>

        <?php if (is_tag()) { ?>
            <div id="archive_title">
                <h1><?php single_tag_title(); ?></h1>
                <?php }?>
        </div>


    <div id="featured_home">        

        <?php $counter = 0;
            while ( have_posts() ) {
                $counter += 1;
                if ( $counter > 5 ) {
                    break; 
                    }
                    the_post();

         ?>
        <article class="sticky">
            <div class="desc">
                    <div class="desc_over"><h2><a href="<?php the_permalink(); ?>"><?php the_title(); ?></a></h2></div>
                 <?php the_post_thumbnail(large); ?> 


            </div>
        </article>
        <?php }?>
        </div>





        <?php while( have_posts() ) {
            the_post();
            // it's a post! Display the post!
                    } ?>


            <div class="post_main">
                <h3><a href="<?php the_permalink(); ?>"><?php the_title(); ?></a></h3>
                    <ul class="postinfo">
                        <li>Posted by <?php the_author_link(); ?></li>
                        <li><?php the_time( 'jS F Y'); ?></li>
                    </ul>   

                 <?php the_content( ''); ?>

                <div class="read_more_blog"><a href="<?php the_permalink(); ?>">Read More</a></div>
            </div>

        <?php endwhile; ?>
        <nav id="pagination"> <!-- PAGINATION FOR BLOG -->
            <ul>
                <li class="older"><?php next_posts_link( 'Older posts'); ?></li>
                <li class="newer"><?php previous_posts_link( 'Newer posts'); ?></li>
            </ul>
        </nav>

        </div> 
        <!-- END OF BLOG PAGINATION -->
        <?php else : ?>
         <div id="post">
            <!-- 404 Messege -->
                <h3>404 ERROR!!</h3>

            <p>Sorry we can't seem able to find what you are looking for</p>
            <p><a href="<?php echo home_url(); ?>">Click here to get back to the homepage</a>
            </p>
        </div>
        <?php endif; ?>
        <?php get_sidebar(); ?>
    </div>
    <?php get_footer(); ?>