The moment you reach at peak is time for switching the job

There are many reasons for leaving a job. But if it is matter of career growth, then the moment you think you are at peak of something, is the right time to switch the job. This the time to think for new organisation, job or qualification, or altogether.
Here an interesting question arises. When or how do one start believing that he or had reached at peak of his role. Actually there are many indicators for that. Like
1. You do not feel your self challenged . That means you are enjoying anymore, and think that the challenge has gone...,
2. You seniors feel that you cannot go beyond that.
3. You are not getting due promotions while people previously with you have already moved ahead.
4. You think that you job has become laborious and you just repeating the tasks everyday.
There is no perfect definition. It is different for everyone. And everyone had to determine himself as if the moment has come or not