"One way to increase joy is to anticipate the pleasure coming your way. When you anticipate something beautiful, you are more likely to see it as beautiful. And the joy of it will be more galvanizing, more exiting, more real.
Judaism has a principle called Chitzonit mi'orrer pi'nimiut - 'the external awakens the internal.' This means it is possible to develop an emotional state by acting as if you're already in that state.
Happiness is not a happening. Happiness is a state of mind. You can have everything in the world and still be miserable. Or you can have relatively little and feel unbounded joy."
~ Rabbi Noah Weinberg