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.
I would never advice them to buy any random coins but for any dips it’s always best to secure the funds in stable coins. Looks way promising and better rather than selling it for the fiat and then re buying later. Crypto to crypto transaction makes sure we don’t get taxed for the sell off into bank accounts. At least that’s the case where crypto is now taxed and continuously traced for. I believe paying tax on crypto makes us loose money in the process.