Unless you are sure that your friend is really interested in learning, do not waste your strength to speak about it. Sometimes the best way to convince your friends is by your results, that is what they see.
Talking to your friends about bitcoins and investing in it when you have no results to show for it will only be a waste of time.
Why do it in the first place? Even if you are investing and having good results, you don't need to show it to anyone unless someone specifically asks and you believe that person and know is actually sincere with you. Whether it's a friend or family member, if you don't get asked about cryptocurrencies or investments in them, if someone doesn't show interest or initiates the conversation, you don't need to do it because it isn't going to end well for you and I'll tell you why.
Most humans have a tendency to blame others when they face problems in doing something that was suggested by others when they weren't showing any interest themselves. So, for example, if your friend doesn't ask you about crypto, but you initiate it by saying that crypto is great, and you should invest in it blah blah, and your friend takes your word and makes an investment. Now, if he makes a mistake and invest in the wrong token or coin and loses his money, you are the one who is going to take the blame for it because you suggested it and he didn't ask himself.
So, protect yourself from these things, and keep your stuff to yourself only.