Has anyone built an app as a side hustle?

 I started working on an app thinking it could become a side hustle.

Thus far I’ve built a few things on platforms like Bubble and Lovable, but none of them are making money yet. Someone suggested reading I Have an App Idea to turn these into income generators, but I’m wondering if anyone else has done this or has any other suggestions of things that can help me turn this into a business.

Now I feel stuck. Is it worth continuing with this, or should I look for something else?