Yeah man you are not the only one who has struggled to find the right niche. That is a really hard thing to do, some people make it look easy with super defined aesthetics and stuff but that is one of the more challenging aspects of a music career.
I like one thing I heard about personal brands which is - "The people with the best personal brand usually just do cool stuff as opposed to worrying about marketing themselves all the time" - and that's true I think. If the music is great and falls within one or two main genre umbrellas, I think the rest can work out with time.
Yeah man :).