If you really feel the projects can make 50x-100x, you should hold the token and not sell it if the price is not hit the highest price. But besides, you feel you must research for more to find if that project really has a chance to increase higher. We don't know if NFT will still exist for a long time since the crypto trend can change next year. So if you think that the NFT still gets attention from people and has a good project to invest in, you can use it for your own benefit and leave it while the project is getting down and search for the other projects.