One of the best ways to do this is to meet with another person (or persons) who are interested in breaking out of the mold, and start solving problems. It really helps if people know nothing about the problem, because then they can ask questions someone familiar with the issue would never ask.
Another way to do this is to set up rules that restrict you in one way or another, and force yourself to solve the problem within those rules. It always helps to work with others in these exercises. Groups know more than individuals do.
One important rule is that you can’t say “no.” Whatever someone comes up with, you have to build on it, not deny it. In fact, this is a crucial rule for any kind of creativity exercise. If one “no” slips through, then you’re done for. You’re going to go back to what is safe; to what you know.
Of course, I don’t know what yourself into a different way of thinking. My answers are helpful for those who are trying to make something.
If you want to look at the world in a different way, then you might take a workshop in something completely different what what you usually do. Learn to play harmonica. Learn to construct a house. Go spelunking. Take a meditation retreat. Work on a play.
I’m sure I could go on and on ad nauseam. But I’ll spare you. I think you get the idea.