[CyberFonic]

I assume that your users are finding your app useful, which is why they are using it. If you were charging $10/month for each user, then you wouldn't be having this problem. It would be worth your while to commit to it full-time.

I would have thought that the idea of a side-project is to create a MVP and if it takes off then you have a viable business. If not, then it was an interesting experiment.

In its current form, your app is a charitable act, you are helping others out of the goodness of your heart. Nothing wrong with that, if that is what you want to do.