The point is that I am an "heavy engineer" myself, the kind that go and build databases or filesystems.
With this project I wanted to expand my horizons and learn the business as well.
I could work for FAANG if I just wanted to do engineering, but I want something different. I force myself to don't refactor the code base or add features. I don't want to build stuff (even if I really enjoy it) I want to sell it.
Maybe I should look for a mentor on this space, but I have no idea how to find one...
Any volunteers?
I don't know where you are, but in the US it's worth looking into the SCORE program (Service Corps of Retired Entrepreneurs). This program is specifically intended to provide experienced business mentorship to entrepreneurs. Here's their website: https://www.score.org
In my earlier days, I found SCORE to be incredibly valuable.
But thanks for the link, maybe I can find something similar :)
A lot of the resources SCORE provides on the website may be helpful regardless of your location. You might not be able to get a real-life mentor through them, but they do provide a lot of online instructions and advice.
It might also be worth contacting them to ask if they know of similar services in Europe. They might!
It sounds to me like you need to find a partner who is into doing that sort of thing. That's what I did. As a bonus, someone who is into this sort of thing likely will be able to give you solid information about how to change your product in order to appeal to a broader audience.
Don't forget the first law of business: be totally honest with yourself about what you can't (or don't want to) do well, and fix that gap by finding people who are good at and enjoy those things.