First and foremost there is no magic formula. Your market value is whatever someone is willing to pay you, and there's no rule that this will increase linearly

First and foremost there is no magic formula. Your market value is whatever someone is willing to pay you, and there's no rule that this will increase linearly (or at all) over any arbitrary period of time. You say you want "average market pay." What do you think "average market pay" is for a DevOps engineer with your experience and educational level? Why do you think that? Where are the employers hiring folks at those wages? I'm focusing on more thought-based questions since you asked about calculating your value as it is today, not necessarily just "how do I make more money" which has different answers.