My creativity is SHOT. How can I get it back?

Unfortunately, you can't force yourself to be creative. Sometimes, the ideas just keep coming and other times, nothing. When I don't have any ideas at all, I go back and read some of my favorite books and go over my past ideas. If that still doesn't work, just stop writing and thinking about writing for a while. Go out, chill with your friends, play some sports, or do anything you like, as long as it doesn't relate to writing.