19 year old college student. I asked a question regarding a video game that inspired this question I have around 5200 dollars in my account. I want to spend money on something to improve on but im not sure exactly what. I want something that basically builds myself.

I already have a gym membership and I am signing up for MMA in 2-3 weeks when I finish taking DNP

So what else could I buy/invest that would bring my SMV up in the long run? It doesnt matter what just give me some ideas.

Thanks trp