Not be trapped in the past that has already gone and not feel anxious for future that has not come yet. Put your awareness on your breathing, and aware of you have been already happy and rich. Focus on your breaths and feel present…
Recently practices such as mindfulness, breathing, zazen, meditation or yoga are getting popular to live yourself. I have tried to do some of them (in progress).
The basic steps are breathe in abdominally (consciousness of the inner part of the lower abdomen, just beneath the navel), breathe in and breathe out. I could do this longer when I am in good condition but not all the time, otherwise I am dominated by thinking. I have been trying to do some practices to keep good feeling longer, and I met good method of Thich Nhat Hanh.