I've been working in a call center for almost five years, so experiencing "burnt out" is a normal thing. It's really a struggle, sometimes I have to drag myself into work. Honestly, I'm no longer happy with my job but still contemplating on the next career to pursue. For now, I have to give what is due to the company I work for and help myself to stay motivated.
These are the ways I adopted to restore my work enthusiasm:
1) Pray, Pray, Pray....
2) Read Self-Help Books
3) Appreciate the value of your work
4) Look outside
5) Find a hobby
6) Talk to a friend
7) Get feedback from your supervisor
8) Surround yourself with positive people
It's not easy but it's our vocation to become a better worker of God!