If I were you, I'd limit my niches. You want to be amazing at your niche and if you have loads of different one then you won't be putting the effort into the main one.
If I went to get my hair done, and my hairdresser was also a nail tech and a make up artist, I'd feel wary as yeah she might be good at hair, but she won't be as good as someone who just focuses on hair. If that makes sense? It's better to be amazing and have a niche, than be just good at a few things. However of course don't limit yourself, just make sure your main niche is always the best quality. Good luck