The context would help explain it more, but I will try. Is this an actor speaking?
I felt more, with those earlier films, that I was just doing my job, and I didn't enjoy them quite as much
"just doing my job" means that he worked in the films, but was not enjoying it or putting much into it.
"And I didn't enjoy them quite as much" because he was not that into the work; he was not committed to the story or trying his best.
Student or Learner