I think there is something to be said about the value of the amateur. About not treating everything as a entrepreneurial side project where everything is sacrificed to the financial gods and you make the same choices as everybody else, because everything else would be a risk. Amateurs do things for the heck of it. They don't need it to be polished, they just love what they are doing and want to share that love. If you ever thought about doing anything, a blog, a band, a podcast, a youtube channel, a forum, a new type of thing for which a name has to be found: Do now, think about polish later (if at all).

Places like forums are great, but I don't even think it is strictly necessary need to make one (unless there is a niché that you care for which hasn't been covered). Maybe it is already enough to pick one that exists and to actively participate in it. I remember reading threads where I went like: "Man, these people are really, really into that topic, this is great!"