How can I find out why a university rejected me?
I got rejections from all the universities I applied to for Fall 2020. They all have a standard reply that says "The competition is high."
How do I ask for specific feedback?
Wait until the term starts...
Universities usually don't share this information because you might help a friend apply for the program in the same term
Then, email them...tell them you wish to improve and apply again
I don't guarantee you'll get a reply, but...no harm in asking, right?