The biggest money making slot in crypto space is to be
1. a developer
2. build crypto wallets for new projects
3. find bugs in the system of many new projects
yes some paid for security breaching and all that stuff, rendering professional services is the best way to make money in crypto space now
But not everyone is called to become a developer dude, so for me the in my own opinion is if you are one of the whale investors, you could easily get earn big for sure in trading, though the there is a high risk before they could get a big profit base on my own perceptions.