This is absolutely spectacular, I love it. Have you thought about approaching a programming tools company like Jetbrains to licence/sell it to them? They would have the resources to turn it in to a viable commercial product.
That's a good idea. I should at least try, but tbh I've always just kinda figured they wouldn't take me seriously. Jetbrains seems pretty broadminded though....
Another alternative is crowd-funding, at least to get to a "first shareware-quality" release.