Select a scene that involves 2-3 characters. Write a paragraph from the point of one character. Now write the same interaction from another character's point of view. For example: your paragraph could involve the point of view of a convenience store clerk contrasted with a customer's point of view of the same incident.
If you're struggling with one of you characters, try writing a letter as your current character to their older or younger self. Think of what they might want to tell their past or future self, this might help you pinpoint what's important to your character.