Then enlighten him about the many risks of investing in Cryptocurrency, people should never invest because a friend told them to do so or a friend is making a lot from a particular project, when it comes to investing every one is on their own, because we are very much different from one another, there are investors who can or love to take the risk and there are investors who know when to buy and when to dump, you can start by telling your friend to only invest what he can afford to lose.