When the price of alcoin drops, the best choice is to hold the coin, don't sell it, people usually panic when the market is like this and they release their coins at low prices, so my advice is don't panic quickly, keep yourself under control so you don't experience large losses.
This does not apply to every coin, ethereum and bitcoin is the only volatile coin that can be held irrespective. Other altcoins can be sold if price drop beyond the expected especially in the bear market and one can take the decision to buy back at dipper price. I have a different view on project that the prefers to talk about the coin/project than the lead developer.