Make a list in your journal of the things that make you happy. Try it and in six months to a year go back and see if you can add more things. Journaling doesn't have to be hard. It is all about getting ideas and thoughts down to reflect upon later.
How to Track Your Moods in a Bullet Journal. Weekly, monthly and yearly spreads to take note of your feelings daily. Awesome layouts for journal or planner like this cool, minimalist, combination habit tracker and mood tracker.