If you think that Projects are as more about people and how they work together, as opposed to process or technology, then it opens up a whole range of possibilities and opportunities for you.
Instead of being limited to book,s blogs, mentors that come from the Project Management community, and who often adapt or tailor generalist subjects to the Project Management context, you can just go straight to the vast body of knowledge about people.
In some fundamental ways there's nothing really new about how people engage in "the pursuit of happyness" or politics or commerce in the lasts 2000 years or more. Sure there are many technologies and other societal changes that impact us, but fundamentally we're still people, and still very tribal.
I'm not a classics scholar by any means, but just read a bit of Suetonius (or Robert Graves if you like a bit more of story - which is how I found the 12 Caesars) and you'll see little essential difference between the stories there and what we see in business and political life today.
So this gives us access to a vast collection of material on how people work - independent of the fact that these people might operate in a Project context or high technology.
And if that's the case, consider this old principle in terms of how people operate in your projects, whether you are a PM, or someone else on the team.
This is the principle of "Cui Bono" or "who benefits".
the principle has been used for thousands of years as a way to interpret the rationale or motivation of some action or proposition. It is still used today by police as a primary tool in crime investigation. For those of you of my vintage, "Cui Bono" and the corollary principle of "Follow the Money" were the means by which Woodward and Bernstein cracked the Watergate scandal, to name just one historical example.
It is so powerful because it transcends any explanation, dissembling, obfuscation or BS that people put out to cover their real intentions: conscious or otherwise.
This simple question is a great lens with which to view any action or proposal from anyone in a Project Team to probe whether it's in alignment with the Project Team's objectives, or someone elses.
At the end of the day Project Teams are people, and general people-based principles will most often provide you with the solution to Project Team problems.
You also might want to look at my "No Asshole Rule" Project Team Charter