I think these are some of the things that make a person happy
1)resolution of doubt
2)realizing how much Hashem loves you
3)a sense of satisfaction with everything you are and have
4)the feeling of gratefulness at all the good Hashem gives you
5)the realization that no one or nothing has the ability to control your sense of happiness, being happy is a decision no matter what the circimstances. (Hashem gave us the ability to make that decision)
6)conquering a negative midah successfully
7)Being a giver
8)feeling the true happiness of others