If you haven't already sold your ALTs simply hold if your project is decent. If the project has no future sell and buy into a decent project. This is all you can do to recover your loss without putting in more money. It will probably take a couple of years to recover your loss!
Some ALTs will never recover from this crash!
It is an ugly situation!
agree with your suggestion I hold the token that I have but the project is not potential for the future and lately the price of the token continues to decline maybe I will sell it and choose tokens with projects that really have the potential for the future