If you want to convince him to let him believe in bitcoin, then show him proof that you have made a profit on bitcoin. The proof is the only thing bitcoin skeptics need, they don't require you to explain at length when you have not yet made a return on your investment. Your friend has a lot of money, and if you are poorer than him, there is no reason for him to listen to you. Like me, I would recommend bitcoin to my boss, but he is richer than me, and I can't teach him to get rich. That is ridiculous.