buy back,
when the price drops, everyone who dares to take risks will put a buy order lower than when he sells
this is very risky because we do not know whether our selling point is the lowest, or still can come down again
For now I think you better not to panic better you patiently wait for altcoin and bitcoin prices to stabilize again because if you panic want to sell or buy the coin it will be easy to lose profit because soon I am sure if altcoin price and market price are all will be stable again