I wonder why that is – is it because I’m more eager to hack on early prototypes of fun ideas than continue them? Or is it because the code base is so development-unfriendly that working on it is just no fun? (For example, there’s no automated testing.) Soliciting feedback.
It seems to me that you might do well to try to find a co-founder to work with. You're clearly full of ideas, and have the skill and discipline to get an MVP out there. Nicely done.
However, I think that having somebody to share the ideas with, prod and poke you, and share some of the burden, might help you achieve more.