Honestly I would say there's no need to.
You can let them know about Bitcoin but not try and persuade them into starting crypto.
Sharing knowledge is one thing but how the person who the knowledge is been passed to recieves and take the knowledge is up to them. Except in some way or the other you'll tend to benefit from it.
Telling them and explaining to them how they can benefit from Bitcoin is not like persuading though, if after he told them and they don’t still want to invest into it and he tries to sugarcoat it more to them will it be them called persuasion. Explaining to them physically about bitcoin and how it operates is essential for also mass adoption of it, just like the OP said, some people will only believe and trust a new innovation if they have a practical application and explanation to what they want to venture into. If they’re taught and they’re still not showing interest in it, then it is better to let them be and decide. Forcing or persuasion is bad but some people think it is by that we can get mass adoption which in actual sense, they’re really killing the trust this people will have in this technology if things don’t go as you’ve sugarcoated it for them. Let them decide, grow and learn though by themselves, it is better.