Don’t work full time. That’s how to do it. Of course, this will mean less money, less stuff, smaller stuff, possibly a change in your social life, maybe even moving to a society with less materialist values. But your quality of life will not suffer, quite the opposite. I speak from experience. Beyond a certain number of hours, work has a cost to one’s quality of life. If you are serious about reducing that cost, there is only one way to do it. Work less.