It’s crazy how helpful those eyes in the back of your car are! I’m completely reliant on mine, too. If your camera has undergone significant hardware damage, you’ll want to take your car to a trained professional to handle the repair.
However, if the lens is simply blurry, you could fix the reverse camera in your car yourself. Your lens could be covered in dirt, mud, rain, or some other form of condensation, in which case, you should be able to clean the lens with a microfiber cloth. Doing so should clear up the view.