Vortex Sound Research

I'm in high school and my budget rn is like $150 so I'm looking to buy something but I'm not sure what. I currently have an Arturia Keystep, PO33 K.O., and Ableton Live Lite as well as a mic and some junky speakers and I've been able to familiarize myself with all of them pretty well but I still don't know all the much about synths. I really want to produce like alternative hip hop stuff but I don't really have the money to get good equipment so I want to make sure that I get the right thing. I play piano/percussion and know a pretty good amount of theory to be able to compose good stuff but I have no clue what to do now

Ive been looking at a volca fm or ik UNO but idk what for my situation