Add Text Under Categories and Tags in Single Product Pages in WooCommerce

You can use the woocommerce_product_meta_end action hook like this:

add_action( 'woocommerce_product_meta_end', 'add_custom_text_below_product_categories', 10 );
function add_custom_text_below_product_categories() {
    echo '<p>Your custom text here...</p>';
}

This code snippet should be added to the functions.php of your child theme or via plugin like Code Snippets.