I am not exactly clear on the relationships but I gather that it’s something like
Post Type 1 <> Post Type 2 <> Post Type 3
and you want to show either Post Type 1 on Post Type 3 or vice versa.
To eliminate a lot of extra querying, the first thing I would do is to make these relationships bidirectional. This can be done by coding, although this doc is for bidirectional relationships on the same post type https://www.advancedcustomfields.com/resources/bidirectional-relationships/, or you can use a plugin like https://wordpress.org/plugins/post-2-post-for-acf/ and your can find some additional resources in my github repo https://github.com/Hube2/acf-filters-and-functions.
Then instead of doing queries you just get what you need without doing all the reverse relationship queries.
// get relationship field on current post
$related_x = get_field('1st relatioship field name');
foreach ($related_x as $related_x_post) {
$related_y = get_field('2nd relationship field', $related_x_post->ID);
}
