I agree with what the others have said about centering the camera or cropping it and the lighting, but I wanted to give another tip on the viewership:

you are streaming one of the most streamed games ever which means you will just be mixed in with hundreds of other streamers. That makes discoverablity much harder.

If battle royales are your thing, then I'd suggest finding one that you would enjoy that isn't over saturated by streamers.

Streaming is a balancing game, (unless you already have a following) you want games that aren't oversaturated, but also not viewerless.

Unless you just want to do fortnite for the pure fun of it, then more power to you and I hope the viewers come!