I think these are the two best advice you can ever give to anyone and be safe in the cryptocurrency industry. You don’t just save the next individual but, you guide yourself in the process even while stirring the individual in a direction.

Asking them to DYOR puts the ball in their court so they understand the options they’ve got and how it is by their choices to see reasons to believe or not all originated from them, perhaps your pep talk could be a guide but, you let them be a boss of their own like very crypto investor is expected to be.

Not your keys, not your coins!
No better way to be both cautious and safe than not following these principle. It ensures you keep your Bitcoin on a non-custodian wallet as well as, keeping your keys private.