Just holding some altcoins that I've bought in a higher price and buy some potential altcoins in a cheaper price, this is what i do from now, and hoping that the market will rise again.
Now a day it is good to wait because price has too much chances to rise. So all of us should buy some profitable coin so that holding will give good money for future. In this situation no one should sell or quit because it can decrease your profit. Same as you I will try to hold my coin and will try to buy more in future.