Ratings work like this: You get a 10 on default, and if a person gives you a 9, it'll drop. If a person gives you, like, a 2, it'll drop to maybe 6 or 7. Your ratings are affected more visibly if you have less people giving you any. The more you do, it'll be harder to do so. Ratings don't really matter, though, not really. Engagement via likes and comments are more important, iirc