Yes, you have reached the zenith of your career. Congratulations. You are self-sufficient and able to provide for the financial needs of your family. This is a true victory.

Now, it is time to focus on people other than yourself. Most other advice on here is awful; it amounts to different directions to run on the hedonic treadmill.

Instead, you have to give back now. What good is there to be done, that only you could do? What will be worse off if you don't lend a hand? This can range from finding better ways to support and mentor your children, to donating time to tutor students in programming, to building a well in Africa. Think hard about what you really care about, and then work hard to bring that into being.