(a) You should you whatever makes you happy. If that's work then ok, but see (b) (b) If doing "work" is what makes you happy, then when you are doing work on y

(a) You should you whatever makes you happy. If that's work then ok, but see (b) (b) If doing "work" is what makes you happy, then when you are doing work on your own time, I'd suggest trying to stretch yourself. Try to do something which seems difficult, or radical. Allow yourself to fantasize that you're going to become famous by doing this thing whatever it is.