Even after the median increase, a 171 is still a 75th percentile or better score for most schools. Get your apps perfect and have them submitted as early as possible. A retake would help but I'm not sure how much.
@Kateryna my diagnostic was ~158. My average after taking a few PTs right after the core curriculum was ~165. My average after finishing most of the PTs was 171.
171/2.93 cGPA and about to start my second week at Northwestern. You absolutely have a chance. Make sure you write a strong PS and addenda to help bolster your application, and apply to as many schools as you possibly can!