Jobs are level based: you must be at least 15 levels below the job you are seeking.
Job level 50 you must obtain OL35
Job level 75 you must obtain OL60
Job level 100 you must obtain OL90
Job level 135 you must obtain OL120
Job level 150 you must obtain OL135
I am hoping the he does as some of the players have done.
Take a short cooling off period then return to the game.
We all get frustrated at times, taking a break can and will help.