If you don’t know the answer to this question. Try this:
What improves because you persist?
What actually improves is often not what you initially set out to measure.
The thing that improves might be:
Your ability to notice what matters
Your relationships with the people involved
Your understanding of the work itself
Your capacity to stay present even when it’s difficult
The conditions you create for others
And if you don’t like the answer, you know what to do.