Notice the joyful moments in your day, however small, however fleeting. Notice how good it feels to have that first sip of your drink. Or how tasty that first bite of food is. The pleasurable feeling of your skin in warm water when you wash your hands or take a shower. The moment of delight and comfort when you see your friend.
These thin slices of joy only last a few seconds but they add up! The more you notice joy, the more you will experience joy in your life.