After all either market crashes or it goes up and all of us has to do is one god dam thing, you just hodl your crypto tight, either move them to stable coin economy to stop the losses.
I'd go with a different advice and tell people to actually think twice or thrice about the 'crypto' they actually bought — if they actually do something decent, or if it's just your typical useless yet overpriced cryptocurrency. They need to sober up sooner or later, unless they want the markets itself to sober them up by teaching them a hard lesson.
Sometimes people tend to buy only based what they can see people hype up over the internet without even thinking on the decision they made for that time so for this kind of actions they mostly encounter the hard lesson they faced. And that's expensive experience because we lose something huge before we learn something from our own mistake.