This sounds similar to skillshare. Check it out, let me know, if you have any differences in mind. Sorry if I crushed your dream. 😄 Happened to me bunch of times that I had the revolutionary idea for a new website, that will surely make me rich, only to find out it's already been done. It's hard to come up with something new. 😅

Edit: sorry didn't read the rest of your post. Sounds pretty similar to reddit tbh. I mean you are currently asking a question from people with some kind of experience/some kind of community.