Whis platform gives lowest fees to trade crypto on

I was using OKX and i would sell when it reached green i made around 200+ only to find out later that each fill they did for me either sell or buy was 2.3$ and all orders had thier own fees depending on each transaction so i lost around 4 $ each time i traded without knowing it that 200$ was around 50$ left at the end, which is ridiculous to be honest, i was wondering if there is a better way to trade