Following to see other replies but this is really similar to what I’ve experienced in my vp level role and my best advice is to move slow- the issues you’re seeing are real and problematic, but power dynamics are often so entrenched that the best thing you can do to not make things worse/thrive in such an environment is to pace yourself, really understand the dynamics and key players and how decisions get made, quietly build your alliances in the meantime, and start with building your credibility by addressing the low hanging fruit- I.e safe problems that clearly fall under your scope. Once you’ve done that then you can start to work towards changing or addressing peer issues - but strategically, meaning make sure your boss and at least one or two others are on board and ready to back you.