If you believe in the future in some coins, you can indeed hold it for a long time but I wouldn't really hold very long NFT's; I have the feeling that the hype is slowly fading away . I never understood the real use of NFT's so never invested in it but the only advice I could give to NFT holders is: take profit when you can!
Many people believe on luna and they think that its future is bright but what happened? Luna crashed hard leaving the people devastated with major losses. Having a belief isn't just enough but we also need a luck here. We won't know what if the coin that we trusted the most will also end up like what happened with luna.
Doing a constant research and seeking information from the news is also helpful so that you will know if what is coming and you can sell your coins before everyone else do it. That should still give you some good gains. In the case of nft's, some of them are useful but we can follow the same advice that I said earlier.