I know how it's done.

Find a problem, solve it, charge for the solution.

All you have to do is fill in the blanks :)

It's not really tongue-in-cheek either, there are LOADS of books about this, but in the end it's all about finding a problem, providing a solution, and charging for it somehow (Time, licenses, platforms, whatever)

The best way to get there is to talk to people, don't ask them to think of products, just ask them how they go about their jobs and find out what the pain points are.

Where are they spending time on things that could be automated, or made simpler, or just eliminated by changing methodologies.

Ask yourself questions about the advances in technology. What would you do with a terabyte of flash memory in your phone? NVIDIA makes some incredible chips that currently cost about a thousand dollars; what would you use them for if they cost a hundred dollars or ten dollars? What would you do with a teraflop in your phone? Is there something you can do with AR/VR other than shooting and killing things? How can you implement remote work to make it practical and popular; is commuting to an office stupid? Talk to your parents and grandparents about their problems; can you solve them? What would you build for an Internet that is intermittent, not continuous? Can you build a gig economy that treats the workers fairly, not exploiting them?

Ask around for problems, figure out how to use technology.

I would recommend reading Lean Customer Development:

https://www.amazon.com/Lean-Customer-Development-Building-Cu...

There's a good articles by PG on his blog, it speaks of doing things that people today will think of as dumb but folks from 3 decades + will find it absolutely normal