All side projects suffer from this fate once they get serious enough. Suddenly you can't just do the fun stuff; the other 90% work that's more mundane now needs your attention.

This is where you have to decide if this side project should be: abandoned, continued as a slow burner, or become a real business venture requiring serious work and resources.

As a person who habitually creates new side projects of various complexity and then abandons them equally fast, the only advice I can give is: don't let anxiety get you to you no matter how you decide to move forward with this or other side projects.