Well, maybe you do care, but only because your paycheck (or reputation) is on the line. However, this isn’t always sufficient to keep you bringing your best to the work. You have to have a well-established through-line that provides baked-in motivation to keep working when things get tough.
– Misplaced ego: You’ve made the work all about yourself, so when there’s little acclaim on the line you can’t quite gear up for it.
– Old problems, new you: You’ve personally moved on from the problems that used to intrigue you, but you’re still plugging away at them.
– Black Box Phenomenon: You’re plugging away at the work, but have absolutely no clue why any of your required tasks are relevant to the larger mission of the organization. You’re all “what” with no “why”, which creates dissonance.
Solution: You have to be brutally honest with yourself about issues of motivation, and do your best to tie your work back to a deeper through-line that motivates you. Sure, you may not always care about the specific tasks, but how you work says a lot about who you are as a person, which I assume you do care a lot about.