You can hold your NFT tokens for a while but not hold them for the long term and not use NFT as your long-term investment. I consider NFT tokens as a short-term investment as the price will change faster than other altcoins and many NFT projects do not have a chance to survive in the long term. Maybe some projects can survive for some time, but not many of them can do that. I suggest you sell your NFT token once the price rises higher and leave the project and not invest in them again because you already make a big profit and you can search for other reliable projects to be your next investments.