You get rich by giving society what it wants but doesn't yet know how to get AT SCALE. What can you provide for society that it doesn't yet know how to get but it will want and providing it is natural to you, within your skill set and within your capabilities.  Then you have to figure out how to scale it because if you only build one, it's not enough.  You've got to build thousands +  Steve Jobs/Apple figured out society would want smartphones- a computer in their pocket that was easy to use. So they figured out how to build it and then they figure out how to scale it.

Leverage is the force multiplier of the world, the principle that allows the small to move the large and the few to influence the many. It’s the idea that a little force, strategically applied, can yield outsize outputs. At its core, leverage is amplification. Consider the author who took the ideas in their head, put them in a book, and sold millions of copies, or the Wall Street investor who made a single decision that resulted in billions. Or even the CEO who directs the people working for them. All of these examples are leverage in action. In personal development, leverage is about identifying the key habits, skills, and relationships that will impact your life and work most. It’s about focusing your energy on the critical few rather than the trivial many, about finding the points of maximum leverage where small changes can cascade into massive results.

Takes just as much work to build for a niche market as it does for a big one. Go after biggest opportunity that you can care about.