Unless the development team make a move, we can do nothing about dead coins/tokens. If a project is marked as scam, just move on and invest on other project. There are promising project out there which might possibly recovered your losses from other coin. We can't neglect the risk on investing, so please make sure that you can afford to lose your invested money.

It's sad to see failing projects but to decrease the risk, I recommend you to diversify your investments. In this way, you'll not miss any sudden pump of a project. Make a good research about the project you are investing.