You can develop a website that gives free advice and guides to the beginners, how to avoid scam investments, websites, and exchanges.
Sort of like that, articles that will help them know more about bitcoin, blockchain, and crypto.
+1 on this advice since you can do both things,helping the community and also building your reputation.because your knowledge is really what this forum needs to have.
He can do that because he has already the initiative.
And thinking about the profit will comes next. Ads can be the main source once he has already setup the website.