One of the hardest parts of changing a culture isn’t figuring out what needs to change. It’s getting ten minutes with someone senior enough to back it, and not losing them.
I’m assuming you’ve seen what needs to change. You’ve probably seen it for months, in the same recurring complaints, the survey comments, the same people leaving for the same reason. Now you have a short window with somebody senior enough to act, and the message just doesn’t seem to land.
This is where culture change usually stalls. Not in the plan, and not in anybody’s appetite for it. It stalls in a conversation where the person carrying the idea and the person who could resource it were standing in completely different places, and neither of them noticed.