Your chances for interviews are limited since you have no non clinical volunteering, only 20 hours of shadowing and no clinical exposure other than research. In the coming year you should accumulate 150+ hours of non clinical volunteering such as food bank, homeless shelter, etc. as well as another 30 hours of physician shadowing (including primary care). You should also accumulate 150+ hours of clinical volunteering/employment with patient contact (not research). You will need those hours in case you reapply.