How rare is it to move beyond a plateau with a counselor?

What are reasons for “plateauing” with a counselor. Do you stop going at that point? If so would you consider going back to the same one?

Or would you choose to stick it out and keep working on issues? What would be the factor to continuing productivity.

Is there ever a point in which going to a counselor is a range between unnecessary/unhelpful to unhealthy?