Since I was 20 I've grinded away at my career, side hustles, etc... It made me happy. But at a certain point I got far enough ahead I felt complete. I needed a boring phase.
I now wake up, have breakfast with my family, go to work, come home, play with my kids, watch a show, and go to bed. This is a day I would have scoffed at 10 years ago. But it now makes me happy. I don't think it would make me happy if I hadn't went for something the last 15.
And it might not make me happy forever, but it's perfect for me right now.