Does anyone have any suggestions for careers or lifestyles where one can feel a sustained sense of satisfaction? Or indeed a rational means to select/create one?

I see the following occupations as absolutely required to live a happy life: one has to be (1) an Artificial Intelligence researcher, to change the world to be a better place, (2) a dancer, to experience one's own embodiment to the fullest, (3) a writer/poemer, to explore and reify one's understanding of existence.

ETA: ;-)