Karma is only cause and effect, it brings the results of actions, nothing more or less.
Dissatisfaction occurs because of the ego. If the ego is removed, the consciousness is liberated.
The very nature of the consciousness is happiness. It needs nothing to be happy; it is just happy, by being what it is.
Therefore, we need to eliminate the ego.
Real happiness has nothing to do with "gaining" or "losing."
"Do not worry; cultivate the habit of being happy." - Samael Aun Weor