It's going to take time before you find your "niche" in clients. The one thing that I always see a lot of freelancers do is immediately pick one area of their profession and ONLY focus on that.

For example, someone who does Music Production but ONLY works with Trap artists. and won't work with anyone else. While yes, you found the group of people you want to work for but how many opportunities did you just miss out on by shutting everyone else out?

I go over the "external specialist, internal generalist" approach to picking a niche.