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!
I think that is depend on the altcoins you are going to hold mate, if you hold the wrong altcoins it will be useless to hold it for a years, and your waiting will become useless too. But if you made the right one altcoins to hold in a long terms like Ada, Energi, Nem, Eth, Atf, Xbx, Kcs, Pundix and more for sure this will give you a huge of earnings in the end.