I’m not an admissions officer and if were up to me you’d be in!
I don’t think anything is lacking at all - you seem like an excellent candidate!
It is just a matter of available spaces, there are not enough of them!
Please don’t dwell on anything you ‘could/should’ have done - enjoy all of your many accomplishments and all the hard work you have put in and remember that it is not where you go, but who you are that makes you a success! You have a ton to be proud of already! Congratulations!