One thing to keep in mind which I think you’re not realizing is the whole concept of hooked applicants. Harvard’s 5% admit rate is inclusive of hooked applicants (URM, Legacy, Recruited Athlete, Donors). You’re not any of these, so your chances are really more in the 1-2% range at best.
You keep thinking there’s some sort of chance-enhancing checklist you can work off of.
There isn’t.
Do the best you can in school, get the highest test scores you can. Take as many AP’s as you can etc.
Try and do meaningful ECs (a good school will be able to detect resume-padding activities a mile away), and good luck.
But…as many have said here. You need to be looking at other schools. There is not one single thing that you’ve said about Harvard on this thread that does not apply equally (and in some cases more so) to dozens and dozens of other schools.