congrats - I agree with your approach of getting a real business working before worrying about solving every possible problem that will arise.

It took my startup 6 years of hustling to become profitable (we're around 50k users now) and we did it basically just as you are doing it - creating a product that people wanted, and then just adding features and solving problems as they became known to us rather than trying to anticipate things that may never wind up being important. It feels a bit like flying by the seat of your pants unfortunately but I think it's always going to be that way.