Reading about systems theory. I read Niklas Luhmann (e.g. Trust and Power) in undergrad and it made strong impressions on me. Throughout my PhD (sciences), I tried to view every problem I tackled, every collaboration from the lens of understanding the social system of the research scene, the problems tackled, the conversation happening within that community etc.
I believe systems theory can provide a real edge when competing with people who few most things at work as intellectual d*ck measurement contests, including career advancement based on naive notions of being just more clever, or just working harder to advance. Especially in academic settings, focusing on the social dynamics of your research community is key.
N.b.: This is under the consideration that you are already good/constantly improving your main professional skill, be it coding, writing, selling.