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 have kept them for several months now but I have not seen their prices improve but also more and more diminished.
I don't know if I should keep them. It's sad for today's altcoins