In my experience, crypto or more specifically, Bitcoin users are much more difficult to scam, people who get scammed easily are those looking in from the outside who think Bitcoin is a get-rich-quick scheme and would fall for any scam attempt which as much as mentions Bitcoin.
Really?
I think that they are far easier, people who have a negative view of Bitcoin are usually the ones that don't trust anything that could bring gains, either because they lack knowledge or because they have had previous experiences with scam schemes.
Good luck making a guy who claims bitcoin is a Ponzi scheme invest in something.
Also, you should take a look at how things went around here even before Bitcoin went nearly mainstream lets' say, a lot of really old users have been scamed in the past, from stuff like mining gear from bfl or investment schemes like Bitcoin Savings and Trust, you would be amazed how many have fallen for those.
Firstly, you can become a trader,
There's also the opportunity of becoming a P2P trader
You can become an expert in technical analysis and give accurate signals to daily traders
So, it's all about trading in the end.