I recommend: BTC, ETH, LTC, DOT, XMR, for long term. You could also try the DeFi coins such as: KAVA, KNC, YFI, UNI, MKR, etc. Or you could have more luck with some AI coins https://cryptoslate.com/cryptos/ai/ or AGI.
It's very hard to predict the wild swings of the market. If you need to...