When was the last time you read something, saw something or heard something and went something like this:
„Wow. What a surprise! I didn't expect to read that. I didn't expect her to say that. I REALLY didn't expect her to do that.“
If it's been a while it's a good sign that you've been coasting in your own territory for a bit too long. That you've gotten too comfortable in your own skin. And your opinions. And the way you see the world. The people you hang out with.
If it's been a while it's a good sign that you've only read, heard or watched stuff you already knew before. Stuff that confirms your worldview. Stuff that confirms your biases. Your prejudices. And your general train of thought.
Stuff that fits into a box. Your box.
So every once in a while try to read outside that box. Try to watch something outside that box. Try to meet people outside that box. Because that's the only way to get rid of that box you might have put yourself into a while ago..