my_topics.php

<p>
    <?php
    $tags = get_author_tags(get_the_author_meta('ID'));
    $links = array();
    foreach ($tags as $id => $tag) {
        $url = get_tag_link($tag->term_id);
        $links[] = "<a href=\"{$url}\">{$tag->name}</a>";
    }
    ?>
    My Topics: <?php echo implode(', ', $links); ?>
</p>