I saw a lot of stupid responses here so check this out if you want to know the real answer. It all comes down to risk. If you aren't willing to risk much just farm stablecoins for 20% APY. If you are willing to take more risk buy BTC and you might double your money in the next couple years. Want to do a 10-20x, look in the top 100 coins. Things like ICP will pump from their low of 20usd to their previous ath of 500usd in a bullrun. Want 100-1000x gains, buy some microcaps like UTNP, 0xMR, and Shiba. You don't have to go all in on one thing, consider a portfolio of 20% stablecoins so you can buy the dip in a bear market, 20% bitcoin, 10% microcaps, and 50% in the top 100 like XRP, ICP, IOTA, FTM, and Celo.