The Chicago Bears as a team need to dominate the time of possession
Simply put, in order to win the Bears need to hold onto the ball as long as possible and keep the Lions' offense on the sideline. Offensively, the Bears are built to run the ball and carry out long drives with the possible exception being a play-action deep shot after a steady rushing attack. Over the last year and a half, the offense has proven that they can run the ball well against almost any defense, so continuing that identity should provide the Bears with a good time of possession.
On the defensive side of the ball, if the Bears can play strong defense and get the ball back to the offense quickly, the Lions' defense will eventually grow tired throughout longer drives and the game as a whole. Especially throughout the early stages of the game, possessing the ball and forcing the other team to play catchup will dramatically help the Bears' game plan.
All too often, the Bears are on the wrong side of this dynamic. Simply look at the Chargers game, where the Bears' defense allowed an opening score touchdown, and then a quick offensive drive gave the ball back to Los Angeles before the Bears' defense could even catch their breath on the sidelines. If the Bears want to win, flipping this script and grabbing the reins of the game early will greatly improve their chances of leaving Detroit with the first win with Fields in over a month.