Not to move is seen as a sign of failure. To stay put is to be left out. You obsess on the fact that something needs to be done even though you don't do anything. And your're trapped in the knowledge that your life is just an assemblage of fragments with no meaning. We start to think we are eroding from inside.
Age is a killer.
Once it was so simple. But now now we cannot rely on predictable tracks of promotion and we can't count on a lot of affirmation of our work from outside ourselves or structures to guide our choices. We have to learn how to own our own work it is yours, and you have to invent it or at least own it. I didn't say own the job that belongs to your employer. But your work must be your own.