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!
Majority of altcoins will never recover some of them will just vanish and only a few will have potential, this has been the scene ever since these altcoins comes up, the competition is very stiff, even if the project has a unique idea but failed to generate support it will eventually die.