Instead of trying to feel happier and a deeper connection to the world through a mantra, noticing your breath, positive self talk working out or going to a yoga class (all fine techniques) try giving a gift to others. Give a gift to everyone you meet today. Whether or not they know they are receiving this gift is not important.
On my way home last weekend I had 3 other drivers in cars in the span of 15 minutes slowly run stop signs in front of me. Luckily we all were in parking lots so these were low speed interactions. I happily waved at them as they crossed in front of me as to say