Rule #7 – The Laws of Inertia Apply to Your Career
My point is that this law can be applied to a marketing career as well. If it's been some time since you made an upward move in your current company, it will take a significant amount of effort to move off your current plateau. And there may be outside forces, such as your co-workers are comfortable with you being where you are, working against you.
You may want to consider whether you are happy at your current level or willing to apply that extra force by looking outside your current organization. I hate seeing employees work year after year for promotions that stay just out of reach when I know they would be capable of so much more in a new environment.