Be contented, but keep striving for a better life.
You have bought a car, yes, strive for more.
You have opened one branch of business, what's stopping you from trying to open another one. Don't be greedy, don't be stingy, but don't be that person who feel they have arrived, there are greater heights to conquer.
If those making billions are looking to make trillions, you that is making millions should be looking for how to make billions too.
The irony of life is satisfaction is just a stone throw away, while you keep seeking for more, exercise contentment in what you have achieved and let it be a guide for you to achieve a lot more.