I’m saying that picking a niche can be part of what makes up a style. It doesn’t have to be part of yours.
I love that you want to explore all different forms of writing, I think it’s a great idea. Business and technical writing are kind of boring though. :P
The best way to find yourself is to DO. Write a set amount of words every day. You will find things you like and things you don’t like over time.
Eventually you will find the sweet spot where the writing you love to do and what people want to read intersect, and you’ll be golden!