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I can't answer you directly but if I were in your shoes, I would ask myself what I would want to accomplish from this. If the answer is something vague like grow it into a sustainable business with more users, then it's probably not the right one to pursue (for me in my own opinion).

Every idea with intent of becoming a business has the goal of growing and being sustainable. That's too vague. I would prefer to work on ideas that I care deeply about because those are ideas I enjoy the most and if that is true, there is often a more in-depth goal of where I wish the idea or project to be headed even if I don't necessarily have all the details or answers mapped out.

If you don't have an answer like this in mind, at best my suggestion is to keep thinking until something feels right.