Give up the idea that "more is better."
We live in the most affluent culture the world has ever seen. Estimates are that although we have only 6 percent of the world's population in America, we use almost half of the natural resources. It seems to me that if more were actually better, we would live in the happiest, most satisfied culture of all time. But we don't. Not even close.
It's not that having a lot of things is bad, only that the desire to have more and more is insatiable. As long as you think more is better, you'll never be satisfied.