If you’re on the same page and you just need to display the same page’s content again, you can just call the_content multiple times.
To answer your question, however:
You’ll use the page_id argument for WP_Query (you could also probably use p). You can even remove your global $wp_query and the like.
<?php
$new_query = new WP_Query(array(
'page_id' => get_queried_object_id()
));