My son was in the same boat as you last year. He re-took the SAT (and showed a significant improvement), took a rigorous fall semester at the local CC and did well, tried a new sport and did well, improved his PFE, and had two new personal letters of recommendation written to supplement the academic ones. He also made contact with a local academy grad, and did another interview. Good things happen to those who truly show their interest by becoming a better candidate.
Good luck to you! I know it is hard to wait, but it was the BEST thing for our son and family. I think he will do much better this year than he might have last year with the extra year of growth and maturity, and he most definitely appreciates his appointment much more due to the wait and the effort he put out. You can do it!