Aside from inheritance, the only way to build wealth is to build a business and invest. As long as you rely only on your ability to make money, you're limited to the number of hours in a day and how much you can make each hour.
When you own a business, you make money off of each person that works for you. And when you invest it's a similar strategy, each dollar is like your little employee that makes money for you. Those are the only ways to build wealth.