Is your goal to get into medical school or to get into medical school quickly? If you dont start in 2019 will then move to a different career path? are you willing to reapply without much improvement in your application, thus likely being rejected again and making your chances of ever becoming a doctor much, much lower? You submitted in June and have no, none, nada, zilch, zero additional volunteering since then and only now are you looking to enhance your application even this is the weakest part of your application? Your non-clinical work is health research, you have diabetes molecular research, you have plenty of that but not nearly enough clinical and non clinical work to even consider applying in the first place. Your summary is a great example of why applicants shouldnt reapply immediately as they are nearly blind to their chances in the first place. So I suggest you get your head out of your A$$, and seriously consider a major time investment for a year or two in clinical and community service projects perhaps even Americorps, Teach for America, Peace Corps etc.