Advice on investing (21)

Hello to whoever is reading this

Im 21 in college, I have about 12k in the stock market (tech) and about 9.1k in (VOO) in my roth ira. I have roughly about 45k in free cash, live with my parents, they support me, and don’t have anything to pay besides a 400$ car payment. My question is how much of my free cash should I invest if I’m risky and am willing to hold on for a long while. Also is it smart to put my money in lets say a ETF in a regular brokerage account and sell whenever i need (lets say 5 years). I just feel like it’s useless having that much cash just sitting if I’m doing nothing with it.

What do you recommend let me know. Thanks!