The next rung is a System Administrator. You'll need to learn a few additional OS's and a bunch of gnarly hardware. Following that, go into either Dev(programming), Sys Engr(hardware), or DB(data).
After you've spent 15 years of your life working your way up the ladder, your job will be outsourced to the slums of East Beijing and the best you can hope for at that point is to start a new career in another field. Good luck!
Your MS degree won't mean squat because they are easily faked(or bought) in places like India, Phillipines, Vietnam, China, etc.