I just started a document conversion API. Its only making $20/mo now but I think I can build to $2k/mo after a little more refinement and some advertising steps

I just started a document conversion API. Its only making $20/mo now but I think I can build to $2k/mo after a little more refinement and some advertising steps. But this is not make a living money. Combined with some freelancing gigs and other SaaS things it becomes living money. The biggest upside is the stable revenue which allow you to be even more creative.