If you learnt even one thing from the effort, then it was worth it. Not every endeavor will bring you financial rewards, at least not directly. If you took on the effort because you loved the idea, rewards will flow via other means.
It's easy after-the-fact to see that, but it's hard to know when it's happening. Possibly the most celebrated entrepreneur is Elon Musk, and I don't think there's any question he put his company before his personal life multiple times in order to succeed. But how many other people have done that and then failed? It can leave you as a shell of your former self.
Everybody talks about the upside. Nobody wants to talk about the downside.
But this is the point of life! The experience.
Now I'm onto something else.
There has to be this drive to do something different, something that you love and that will make a difference. Sometimes it takes more than one try to find that one thing.
It's the modern form of a luta continua, vitória é certa. How else would you succeed if you don't try, and fail, and fail...
That, or stick with your day job, even if it bores you to death.