Become the person they’d hate to lose. That’s job security nobody can write into a contract.

Rules and contracts protect you only up to a point. What actually keeps you in the room is being the person whose absence would be felt immediately, the one who knows how the thing runs. That kind of standing is not written down anywhere, which is also why nobody can quietly take it away.

Find the gap nobody else wants to cover and become good at it. Learn the system, keep the notes, be reliable on the small stuff. You are not trying to be liked, you are trying to be useful in a way that is hard to replace.