Take a piece of paper and write the down the top three things that make you most valuable in your job. What are the things that only you can do? What are the things that make the most impact? If you spoke to your direct manager, what would be the things they would say that they want you to be spending your time on?
Now of those three, highlight the most important one.
Take an audit of your week. How much time do you actually spend doing that most important, highlighted thing? In percentage terms, how much of your week is devoted to doing the thing that makes the biggest impact?