Working in organizations larger than 20 people is hard. Having worked with some giants like the Department of Defense (1.4mil) and Ikea (200k+) in the past, the most important first step is to start trying to figure out what kind of organization you’re actually working with.
The Starfish and the Spider is a great book for thinking critically about organizations and the people within them. It uses a few primary metaphors to explore common structures:
Beyond giving a helpful taxonomy of org structures, it also goes into different qualities of leaders with these organizations — specifically the catalyst who serves to kickstart and build starfish type and hybrid organizations with the right collaborators. There’s some helpful rules and tools that get dropped throughout, not to mention more than a few warnings.
I found this to be a pretty fascinating and helpful book for thinking about leadership and organizations, and in particular looking for places to intervene. I was actually recommended this book by an old boss right before joining the Dept of Defense, and it was wildly helpful for my time there. Give it a read.