I do nothing for the altcoins I have in my wallet. I wait for its time to rise again, even though I know it will take time. And right now, many of those altcoins are dropping in price but I'm fine. But I'm still trying to buy more for those coins that have a chance to increase again. Hopefully, some altcoins can improve so I can be as profitable again as before. Now I still want to collect more bitcoins because they are still at a reasonable price for me.
If we are long-term investors, we never have to worry about the current market situation. Indeed the best thing to do is to keep calm and hold, and never mind about the price decline. As long as we are investing in trusted and usable projects, it eventually rises when the market will recover. But with those coins that OP has, I don't think this will have a big chance to recover, yet it is just a little chance. If I have those coins, I already sell them earlier and not to wait for another crash as surely to fall hard than the others.