Gets the slug of the current custom taxonomy then apply to an archive link.
<?php
$terms = get_the_terms( $post->ID, 'my_taxonomy' );
if ( ! empty( $terms ) ) {
$term = array_shift( $terms );
$term_slug = $term->slug;
}
$term_link = get_bloginfo( 'url' ) . '/' . $term_slug;
?>
<a href="<?php echo $term_link; ?>">Tax term archive</a>
WordPress Snippet