For software engineering, “impact” or “value delivered” are pretty much always your job unless you work somewhere really dysfunctional that’s measuring lines of code or some other nonsense. But that does become a lot about politics after some level.

I would not say it’s about getting other people aligned with your priorities instead of theirs but rather finding ways such that your priorities are aligned. There’s always the “your boss says it needs to help me” sort of priority alignment but much better is to find shared priorities. e.g. “We both need X; let’s work together.” “You need Foo which you could more easily achieve by investing your efforts into my platform Bar.”