I'd really like to see the follow-up to this in about 6 months. As somebody lucky enough to have lived the "enough" lifestyle, my main feedback is this: It seems a lot more amazing to other people than it actually is.
Now as somebody with children, you certainly can spend time with them, but I think generally if you aren't finding new challenges in life, it is just going to be boring. I think that is why already rich people still keep working... it isn't about the money, it is about the challenges.
So I wish you good luck, but don't feel like you are "throwing in the towel" by continuing to pick up new projects. If you enjoy your job you don't necessarily have to work for the money, you can just work for the work.