I heard about this way to make passive income a while ago and have had two coloring books published on Amazon for several years. One gets the VERY occasional sale, the other gets nothing.
I figured part of my problem was just quantity, that I don’t have enough out there for people to find. So, I recently published 6 other coloring books, a journal, and a notebook.
Is anyone actually making money with this sort of thing without additional promotion? Should I keep going until I have more books because something might eventually be a hit or am I wasting my time?
