There's usually a cool-down period in-between jobs where when you rejoin the same career, you will pick back up at a point in your career that is close to where you were before. (You usually will start only a rank down from where you were previously.)
If you wait a few days after leaving a job before returning to work, your ranks for the job you are re-applying for will slowly deteriorate. If you wait long enough that you are back to before the point where you had to make the branch decision (Example: Entertainer to either Musician or Comedian), you should be able to then change your decision when re-applying.
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