I'm a little surprised at how negative everyone is about giving advice. I guess it depends on your relationship with your friend. My brother got me into cryptos a few years ago right after the spike to $1100. Even when I was in the red (which was the case for a while), I harbored no ill will toward him. Actually, it was a lot of fun and it strengthened our relationship.
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Not sure if others feel the same way, but I personally try to avoid giving advice regarding crypto less because I fear the ill-will of my friends but rather because I don't want to feel responsible for other people losing money. I prefer leaving that to bankers.
Nonetheless I had a good friend of mine enter the market during the run up to the 2013 spike. I did have a bit of a bad conscience when the markets looked really bad, but it was great to be able to share the excitement of coming out on top after a years-long bear market.