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