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?
I think if it's not so important to you then save as long as possible, and if you're afraid of losing everything then sell everything and wait.
Even if it's important he should find another method to getting the money instead of cashing his investment out.
If there is nothing that he can do then he should just cash the money out.