Reading your original post I get a strong sense that you do not have a solid understanding of what gets kids admitted to these schools. Not knowing you I cannot help you but your resume reads very off target to me. Do you know anyone in real life who’s done this? Maybe find a consultant and do one session to focus your resume before you apply.
You can relax about leadership positions. Very few middle schools have any kind of meaningful leadership. Where leadership can come through is in your teacher recommendations which will say “she’s a leader in the classroom” or “I can always count on her to lead discussion.”
You can also relax about remembering all your awards. You have great scores and great grades and didn’t get in. It wasn’t because you left off an award or two.
I wish I could give you more advice for what to do but not actually knowing you it’s hard.