I've been in that situation a few times, and was always proactive about moving on before losing a job. After I quit my second job (41 years ago) I felt a treme

I've been in that situation a few times, and was always proactive about moving on before losing a job. After I quit my second job (41 years ago) I felt a tremendous relief that I did not immediately understand. Things had gotten worse there over time, and like a frog being slowly brought to boil, I did not realize how bad it had become until after I left. It's usually pretty easy to see the signs that your future is limited, and that is the time to start looking for a new position. In the end, it's only a job, and your life is far more important.