Is it more money? Actually, once you're out of total and complete poverty, increases in net worth have no discernable impact on happiness. That is, unless you become extremely wealthy, and then happiness starts to diminish.
Creating (and maintaining) healthy, emotionally nourishing connections with others will increase happiness.
You can increase happiness by taking even five or ten minutes per day to 'act upon the day' rather than just trying to keep up with everything coming at you. Try to develop a variety of things that can be done in short amounts of time that nourish you. Listen intentionally to some music. Play a little music yourself. Read a poem. Try writing one. Work even for brief amounts of time on a daily basis on some kind of creative project. Try to end each day with a sense of having acted upon the day rather than merely (and barely) keeping up with the demands of the day. If you try and can't manage to increase your happiness, get some help at http://www.heritageprofessional.com