Just patiently wait and hodl it with hope in next bull run sicle maybe some projects will alive and find some investors and mass adoption
No need to expect much to ERC20 tokens got from failed ICOs. I doubt if they can have values in the future. I think they are over since the projects failed already. I am sure no investors will take big risks by investing in bad/failed ICOs. So, just forget all the garbage ERC20 tokens.