if he's open to consuming content made by Bitcoin content creators, then send him an article or podcast that you like that touches on the subject. Make sure you include a SHORT description on what you found interesting ("they interviewed this dude who was using excess hydropower for Bitcoin mining to help level power usage. I liked the part where he talks about how it impacted the local community"*) dont just send a link with no context.

if he's not open to consuming Bitcoin content, then just leave him be. maybe send him some memes that reflect the common ground that you guys share about Bitcoin. maybe it's about how it's a better money or the price or how inflation is wild.

Meet him where he's at. He's your brother first. He doesn't need to see it your way right now. Stay humble.

*I just made this up. not sure if there's an actual podcast about this