I'm a reapplicant this year and I got 3 interviews (again). 2 acceptances and 1 waitlist (Lizzy M ~70). I'm a strong interviewer (based on mock interviews/ and a lot of job interviews), so I knew that wasn't the problem. I was able to talk with some schools about how to improve my app and each time they told me my clinical and non-clinical volunteering was "thin" (I have a heavy research background). Therefore, I had the exact same deficit as you when I applied 2015-2016 cycle. I began volunteering at Habitat for Humanity and a children's hospital to try and strengthen these application flaws. My main advice is to start right now if you plan on applying back-to-back. You need to get those experiences on your primary app and not sent in on a secondary/update letter. These experiences became easy talking points during my interview. I still volunteer at these places because I actually like it. Did I do it at first to check a box? I think you can guess the answer to that question. However, volunteering in these capacities became very meaningful to me, which made "checking the boxes" not only fun, but much more rewarding. As Goro would say, stats get you to the door, EC's get you through.
