I keep some in crypto and some in a few countries national debt bonds (or what's the correct name) for safety.
Crypto can be risky due to having to keep money on exchanges but if you want a super simple strategy to beat crypto trading and you are patient then just wait for good news and buy. You probably want to sell again within 24-48 hours with this strategy and you can hold money in fiat works best. Anyone can do that if they have patience but most people dont have the patience to wait 1-2 months at times to make a trade. Easy 100% ROI minimum with this strategy though i would say buy and hold often better ROI though.