There are so many good coins to hold for long term and one of them that you should prioritize is BTC, we can expect a huge gain in this coin when the real bull market returns and this should be your highest allocation in your portfolio. And the next is pick some major altcoins in the market like ETH, BNB and XRP, your portfolio must be well-diversify so that if one coin didn't work then you have backup plan. And make sure that you invest what you can afford to lose as this is better to hold for a long-term when the crypto market becomes mainstream.