Interesting question from a book I’m reading right now.
What if you didn't need to go to work today? How would you spend your time? What if you didn't need to earn money (or feed your ego)?
The answer to your question is probably your hobby or your passion. Or the thing you were meant to do.
Spend, no, make more time doing it. You don't always have to quit your job. You just have to be deliberate on where you spend your time.
P.S. It also helps to make it meaningful — for you and for others. It adds purpose to your passion.