Wealth is like a clicker game. As you work you earn money, like clicking the cookie to earn more cookies. Once you have enough surplus cookies, you can put them to work earning more cookies, and then put THOSE to work earning even more cookies, and so on. Eventually you're well beyond the point where clicking the cookie makes any damn sense, but you're still in the game, seeing how fast you can accumulate cookies and seeing how far you can go, just for the sake of seeing it.
Welcome to the life of the super rich. That's what investors do -- spend their time looking for ways to spend their money that will make them even more money, just to see how rich they can get and how fast they can get there.
If that doesn't sound like a fulfilling life, think of something challenging and beneficial you can do. Start a biotech startup. Look for ways to clean up oil spills. Invent a new battery. Build a toy for your kids with Arduino. You're smart, and in a position to do things many smart people can only dream of. Take advantage of it.