I tried writing books too.
I can earn more money working for McDonalds or some other minimum wage job. I read dozens of books on online marketing and followed them but I still fail.
There is a recent interview with the sole proprietor that is more business focused https://5to9.beehiiv.com/p/builtwith-generates-14-million-ye... .
This was super informative for me and my search for something similar.
Good luck!
Beyond that, I’ve known people who were single-owner entrepreneurs for years and made enough to pay the bills and live comfortably. Browser extensions, CRM plug-ins, stuff like that.
To answer your second question: yes and no — it depends on the niche. I did some research for my past employer and they accidentally voided the NDA when they laid me off… according to my lawyer anyway.
I’m still not going to take the chance of dealing with the court system to prove one way or the other…. So sadly, I can’t tell you which niches are better than the others.