Now all the markets are crashing down and I don't know what to do with my altcoins. My briefcase fell 30% in a couple of days. I'm afraid I might lose more. Selling or hodl?
Hold. When you sell at a cheaper price than when you bought it means you are losing money.
The only way to not lose money is to hold until you have a better price than when you bought.
Its proven that all the longterm holders will gain from small to big profits. People who get scared will not.