I run Track & Trace Tools[1], an extension directly targeted at the legal cannabis industry's main compliance platform Metrc.
Since it's targeted at businesses and not consumers, word of mouth has been powerful for me. I've rapidly grown in the state of Michigan thanks to a few very enthusiastic operators.
I also went on a slate of podcasts last year to talk about (read: promote) my product. Podcast hosts are always looking for guests, and most of them didn't cost me a thing.
It's also been helpful to be a Google Developer Expert for web extensions, the Chrome team interviewed me and that gave me a platform to talk about what I was working on[2].
> Podcast hosts are always looking for guests, and most of them didn't cost me a thing.
That implies that for some podcasts you can pay to be a guest?
Some charge a nominal fee, and one I had to travel to a studio to record. Made for a nice weekend in LA with my wife.