Is there a way to recycle old Invisalign or make cheap retainers or anything possible to help?????

Had braces for years and then was given Invisalign. I hated them, they were definitely not invisible. I wore them for a while but then I was homeless and depressed. didn't have them with me for a while and then I stopped caring bc I was in a slump for a long time. and now all my teeth look awful. What do I do? Is there a cheaper type of retainer that would work for my teeth? Or is it possible I could like melt the old retainers and remold them to my teeth now? I'm super super self conscious about it.