There are a lot of different strategies, it depends on your risk level and how good you are with computers. If you are risk averse and are good with computers, you could probably figure out how to do DeFi and earn interest on stablecoins. If you aren't you could lend stablecoins in blockfi or crypto dot com and earn money. Bitcoin and Ethereum are safe investments but they already increased in value significantly. You could also buy something that allows you to stake in your wallet, like Celo or NEAR. If you want something with high risk/rewards then look into $MAGIC on Fantom.