You have a long string of high reaches, and you are doing this without a lot of impressive leadership ECs. I might be tempted to think hard about which of your high reaches are or are not a good fit for you with the intention of trimming the list a bit.
Are impressive leadership ECs an absolute must for all of my reaches? My understanding is that Harvard and the other (more “traditional”) Ivy-league schools value them strongly, but I’m not sure how others like MIT, CalTech, UChicago, and Stanford weigh them in the admissions process.
My hope was/is that I might be able to engage in other things like research or volunteering instead (with no detriment to my application), especially since I’ve found that most “leadership positions” at my school are essentially manufactured and meaningless (in terms of tangible action). I’d much rather accomplish something real instead of achieving some silly position/title.