Sad to say but if you don't hear back from a medical school by now, you're going to have to plan to reapply to medical school. Don't feel like you have to reapply again and start writing a new personal statement or update your list of activities.
If you ask, medical schools will give you some information on why your application was not selected for an interview or for acceptance into medical school. You can also ask them what your application is lacking. Don't reapply again when you don't have a clear understanding to as why your application failed to get you into medical school.
In fact, unless you accomplished something major during the past year, you're better off holding off on reapplying. If your application is lacking in research, then a major accomplishment is working full time at a laboratory, getting a letter of recommendation, and having submitted your work (at least submit a poster, you don't need to publish a paper). If your application is lacking clinical activities, then major accomplishment would be to have done a clinical shadowing program for at least a year and have a good letter of recommendation from a physician. Since this is your second time reapplying, a clinical letter can't come from a volunteer coordinator who tracks the number of hours you spend volunteering in the hospital. You need a letter from a physician who can comment on your patient interaction skills and how you interact with the rest of the medical staff.
First time reapplicant is fine, but when you are a third time or fourth time reapplicant, there is a huge cloud or question mark over your application even if you have a lot more clinical or research activities. By the time you are a third or fourth time reapplicant, your application should have been packed with clinical, community service, or research activities. The admission committee members start questioning whether it is your personality that is a deal breaker. "Why is a third or fourth time applicant with all these activities and experiences not getting into medical school by now?" Don't reapply unless you are 90% sure you will get into medical school.