I was doing $15,000 a month by posting constant updates (Not even counting itch.io revenue), if I wanted more money I would do that and post infinite content instead, don't you think?
Have you seen the difference between the Christmas update and the prologue? Yeah, that's because I'm constantly improving my content by working every day, seems pretty good for doing "very minor progress a week.", other games have released at almost the same time as HHG and they remain with the literal same quality as of today, years later. (BTW I posted the Christmas update COMPLETELY FREE, not even beyond patreon tiers!)
It takes time, sorry. I hope you understand it once you play it, and I hope you do. It'll also be free. ♥