If you were already rejected a first time, I would not submit an application a second time unless you can show how you’re a significantly different applicant than you were a year ago. That doesn’t seem the case, so I wouldn’t even consider these.
Do you still have any interest in these? Santa Clara was one that I was thinking of suggesting even before I saw that you were already admitted. I believe that it’s not as challenging to switch majors there, and they also have a business program.
You may well get into a reach school, but staying at UNC while crying every day because you’re miserable does not sound like an optimal outcome. Students tend to do best when they are happy. You sound incredibly unhappy at UNC, and I worry about the toll that this could have on your health if you remain unhappy there for four years.