Once something works, it’s no longer technology. Society always wants new things. And if you want to be wealthy, you want to figure out which one of those things you can provide for society that it does not 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, that’s not enough. You’ve got to build thousands, or hundreds of thousands, or millions, or billions of them so everybody can have one.