I learned most of what I know from the 30x500 course by Amy Hoy/Alex Hillman, but the gist of it is reading and participating in forums, providing valuable advice, and writing articles that spread that advice further.
I haven't seen any of OPs comments, but I remember when Checkly (also in this space) first launched the founder of that was posting a lot here and on Reddit.
I wouldn't say their comments were that helpful or insightful - mainly just advertising. Now they've raised ~$10m. It's spam, but it works ¯\_ (ツ)_/¯
This is exactly what I mean by "market until you think it's too much, and then some" - if it was truly too much, the average forum member would know (imo).