Eyes closed. Deep breath. Don't exhale just yet. OK, exhale. Eyes still closed. What word, wish, or image fills this void? Don't judge it--just hold it close and see what it reveals. You'll never go wrong following bliss or beauty.
Stop buying things you do not need. Live below your means and give away all the crap you don't need. Clear out all the unnecessary possessions that weigh you down--you'll experience an incredible rush of freedom and lightness in your heart that might just lead to happiness.
Disconnect from all media and electronic devices whenever possible. Stop taking information into your being 24/7. Turn-off the cell phone, put down the laptop, get away from the television and do something real--something outside, perhaps something with other human beings of similar mindset or just by yourself; meet new people and talk to them if you want to know what's going on in the world. Debug your brain because it's full of crap you didn't even put there. News/information, the kind you think you need to be kept up to date on will most assuredly squelch any opportunity for serenity or happiness. Strive at all costs to take in less information than you do at present.
A few simple steps might include putting down the sunscreen and sunglasses and getting more sunlight on your face and skin so your body can produce that "happy" chemical called Vitamin D. Strive to eat more healthy fats, especially saturated fat from organic and wild animal sources. Most humans in developed countries in this modern age are severely Vitamin D deficient and starved for healthy fat. The brain gets very down without those two substances.
Lastly, go find someone worse off than yourself and make her smile! Realize we're all just trying to get by and we desperately need each other. This longing is a good thing if it pushes you to connect with someone else. A moment shared in such a state of full and complete presence will capture an eternity of bliss within a nanosecond. The simplest way to be happy is to make someone else happy. Live in the present moment. When you're with someone, really be with them.