Patience , maybe the shark are hungry for your coin, you should figure out what is the reason and make a right prediction after that. Patience is the key, don't be panic.
When the prices is falling, there are only two things I do, first hold it for sell it when the prices goes up and the second is cut loss to buy again in the low price. Why not buy altcoin while waiting for prices rise and choose a cut loss ? Because I've lost a lot of money when i played altcoin, so I decided not to play altcoin anymore
ALtcoins are unpredictable and untrustable coins. there is no guarantee that they will pump again after dropping to the bottom. but BTC is not like that it's already proved it is a best digital currency and suppose if it drops again it will recover within few days.