Is there anything similar where I can do the same with my BTC? I am fine with minimal fees, but is there a place or way where I can buy/sell from BTC to USD or something similar, where it doesn't become expensive if I use it a lot? Are there any Robinhood-type exchanges or places to trade in the world of Crypto and take advantage of the market fluctuating?
Robinhood has already begun offering commission-free BTC trading too. I think they also offer ETH and maybe some other coins too. It uses the same model as their stock-trading platform. See here.
It's available in these states:
Commission-free trading usually just means they're taking profit off the spread. You're usually buying at a slightly higher price or selling at a slightly lower price than you could on some other exchanges. I recommend using Coinbase Pro. It offers commission-free trading when you use limit orders.