After he became interested in Bitcoin through your explanation, did he immediately invest in Bitcoin or did he still have other thoughts through different questions?
Because you also need to tell him about people who are losing because they can't wait for the best price in Bitcoin so you won't be blamed for this later. Because not a few people blame other people or people who give advice when they experience losses through the investment that you suggest. So this is part of the risk and you also need to explain it to him before he starts his investment in Bitcoin within this year.