Learn everything you can about every position at your place of employment.

A shift manager is exactly what it says: Manager of the Shift. When we choose or promote someone into shift manager, it is because we see signs of leadership and qualities we need. If you ask your location manager or general manager about training opportunities for next level promotions ( or go to HR department if need be)

To advance your Career as a Shift Manager, I would say, be proactive, be understanding, obtain more knowledge/ skill of the manager position ahead to Grow to the next level. It is all about Growth, Be the Teacher not the Seeker.

Be the best and over accel as a shift manager.