You can increase positive feelings by incorporating a few proven practices into your routine. Lyubomirsky suggests you express your gratitude toward someone in a letter or in a weekly journal, visualize the best possible future for yourself once a week, and perform acts of kindness for others on a regular basis to lift your mood in the moment and over time. “Becoming happier takes work, but it may be the most rewarding and fun work you’ll ever do,” she says. (from here)