Hi! I believe that 1st of all, it's about the quality of your content. Then the hashtags that you are using (which for me shouldn't exceed 5) and it also has to do with your geo. Tik Tok uses your sim card to check your location, so reaching to audience from other countries, can be a little tricky.
One thing though that i still can't figure out, is why they decide to take down content from someone for "violating terms" etc, the moment you see similar and even more vulgar content being ok, I really don't get that!