How to add related posts on all pages

I tried many plugins but it not help me ??

I used code on page.php

<div class="relatedposts">
    <h4>Related posts</h4>
    <?php
        $orig_post = $post;
        global $post;
        $tags = wp_get_post_tags($post->ID);

        if ($tags) {
            $tag_ids = array();
        foreach($tags as $individual_tag) $tag_ids[] = $individual_tag->term_id;
            $args=array(
                'tag__in' => $tag_ids,
                'post__not_in' => array($post->ID),
                'posts_per_page'=>4, // Number of related posts to display.
                'caller_get_posts'=>1
            );

        $my_query = new wp_query( $args );

        while( $my_query->have_posts() ) {
            $my_query->the_post();
        ?>

        <div class="relatedthumb">
            <a rel="external" href="<? the_permalink()?>"><?php the_post_thumbnail(array(150,100)); ?><br />
            <?php the_title(); ?>
            </a>
        </div>

        <?php }
        }
        $post = $orig_post;
        wp_reset_query();
        ?>
    </div>

As resuld i received only text on page “Realted posts” https://deevora.com/about-me/ or https://deevora.com/how-to-clean-an-area-rug/

Can you help me fix t please?