From Leo Babauta, a few principles worth remembering:
Appreciation. If we have all we need, the problem is that we forget this simple fact. So we can develop the habit of noticing what we already have, being thankful for it, not taking it for granted. We can appreciate the people in our lives (instead of complaining about them), the possessions we already have (instead of thinking we need more), the food we get to eat (which might mitigate our desire for yet more food pleasures), the simple moments that we often take for granted (instead of needing even more entertainment and distraction).
Respect. If we appreciate something or someone, we might treat them with respect. In the Zen tradition, bowing to others and even to your meditation cushion are a deep part of practice. It shows a respect for the world around us, which supports us and which we are deeply a part of. You might not want to bow to everyone you meet, but you can make a mental bow to them, offering respect internally even if you don’t make any sign that you’re bowing. It will show in your other actions.
Turning towards others. If we already have enough … why worry so much about ourselves? Why not see what we can do for others? There are others who are suffering, perhaps starving or facing violence, or perhaps just sick with anxiety or depression. We can’t solve all of these ills alone, of course, but if we do our best to help others as much as possible, perhaps we can contribute towards the betterment of the lives of all beings. This doesn’t mean you need to spend every waking hour devoted to helping other people, but even considering whether your motivations are other-facing or for yourself is a good practice.