TL;DR: The efficient market hypothesis is a lie, there are no adults, you don't have to be as cool as the Very Cool People to contribute something, your comparative advantage tends to feel like just doing the obvious thing, and low hanging fruit is everywhere if you pay attention. The Very Cool People are anyways not so impossible to become; and perhaps most coolness is gated behind a self belief of having nothing to add. So put more out into the world, worry less about whether people already know or find it boring. At worst you'll be slightly annoying. How can you know, if you haven't even tried?
Apparently I live in the Iron Man timeline, so I asked Jarvis/Claude to make this and I got to see it get assembled piece by piece. In the words of Claude, "you have now witnessed art".[1]
Recently I've been commenting more on LessWrong[2]. This place is somehow the best[3] forum for sane reasoned discussion on the internet besides small academic-gated communities. A lot of posts and comments seem impressive, the product of minds greater than my own, the same way that even if I tried for years I probably wouldn't write a novel better than my own favorites[4] or beat Terrence Tao at his own game.
But... even taking for granted the (false) conclusion that all good posters here are unattainably beyond yourself, you just... don't need to be that good to have something to contribute. It's typically easier to notice that step 24 of an argument is fatally flawed than it is to come up with it, especially if you can read a dozen arguments and then only comment on the one you can find flaws in. Sometimes your life has given you evidence that others don't have, or you happened to hear a phrase from a friend that is apt. Sometimes people have good ideas or know a lot but cannot explain them.
Furthermore, frequently people systematically underestimate how good they are at their greatest strengths. When you have unusual skill in a domain, that domain will feel unusually easy. Th