Focus as much of your work time as possible doing the things you already know how to do very well, very fast, and deliver with a great attitude. Know what specialties you want to be known for. The more work you do in your specialties, the better your outcomes. Every minute you spend on the things you do very well will add more value than a minute spent on something that is not your specialty. That’s true, whether you are digging ditches or practicing surgery.
That said, do not fall into the trap of being great at just the aspects of the job you like and slacking on the aspects you don’t like or consider ancillary (like paperwork).
The more specialties you have, the more of your time you’ll be able to devote to high-impact value adding.