I have an entrepreneur in my family. After watching him build businesses I have realised these two things when it comes to understanding what business to start:
- Trying out multiple projects(however small they may be) opens a lots of doors because people start talking to you about their own pain points! and
- Luck favours the bold; you need to take risks.
And one thing is very important, "Get out of the building and meet people".
So is there a luck factor in PMF? No, there isn't. You find PMF when you try different things while at the same time talk to people(past, present and prospective customers).
I will give you an example. The person I mentioned above initially started with a small business of supplying toiletries to businesses(big and small). One day one of his customers asked him whether he would be able to supply instant tea and coffee mix to the business. He agreed and started supplying tea and coffee. Went to other businesses and asked if they would be interested. Got sizeable amount of customers. One day, one of his tea and coffee customers, a defence establishment, asked him if he could arrange student visits to their facility for educational purpose. He agreed. Then went to lot of other schools and businesses and asked them if he could help them arrange student visits. He got success in that! Now he has recently started building a park(with space theme) for students.
So, if you look at the journey it is not some magic with which one finds a PMF. The entrepreneur has to go out and talk to people so that s/he receives the right signals. And then be bold enough to take the risk to start working on the problem.