I'm not suggesting killing of your protagonist of course. No, kill off a minor character. Or an important public figure. Or a pet. Or an elderly relative who has never been referenced up until this time because your MC isn't close to them.
In all my books the death of a character is important to the plot. Death leads to renewal, and it can also lead to change. In Assignment 9, the death of a character changes my MC's life completely and is instrumental in getting her to find a way to reach her goals. In Prayer and Prey there are several deaths, but they all happen toward the end of the book, as a part of the finale. Chasing the Tail Lights begins with death since the car crash is the inciting incident that sets the entire story in motion.
How does killing a character change your story? What journey does death send your characters on?