what can be done? certainly yes hold. Are you going to sell your coins when the price is cheap? of course not. you do not want to lose
I suggest that you should avoid selling just because of panic that the prices of crytocurrencies are down. It is much better to hold them for a long time for the reason that eventually, their price will go back up after few months and you will get what you have lost during the times that their prices were low.