I had similar stats as you! 3.75 with a 510 and a 124 in CARS. I've had 7MD and 2 DO interviews this cycle, indicating that the 124 had minimal impact on the outcome of this cycle (maybe it did for some schools but it's impossible to speculate on this). Instead of spending the time and resources retaking the MCAT, I would spend that time engaging in meaningful activities that'll improve your application. The extra time will also allow you to begin writing your PS, activities, and ultimately your secondary responses. I think a lot of people underestimate how much energy goes into crafting this aspect of your application.
With that said, if your goal is to go to Harvard or Hopkins then I'd probably retake. Clearly that wasn't my priority, but to each their own!