Well, every chest is different, even with cis men. Not all nipples look alike. Maybe this is going to be, for you, a process of acceptance of the way it looks.
While I can't say for certain because I haven't seen your chest in particular, maybe this is a situation where you could un-crater the crater with certain exercises, to build that area up with muscle?
Also, like they said, correctional surgery to the nipple is an option, yet there is the risk of getting a worse result than before, or potentially even losing the nipple altogether. If you've tried exercises and acceptance and nothing is really working for you, and you're still very bothered by this, then you can consider whether the potential benefits of having correctional surgery outweigh the risks. It's your body, so it's your choice.