You better learn by yourself all the projects in which you have invested money. Read what exactly and when they plan to do someth. If these are not reliable projects, you have nothing to expect in the future, then sell and forget. If the projects are working and are actively developing, then in no case do not sell. The best you can do is hold your altcoins. It is not the end of cryptocurrency don't panic
one of the things you need to do is able to hold it in the long run to avoid losses in the current market situation. if indeed the project has a future prospect it is likely that the altcoin you have may be more valuable in the period of a few months later.