@vikingsfangirl98 here are the stats by college for UMN:
http://admissions.tc.umn.edu/academics/profile.html
Your ACT is on the lower end of the mid-50% range so you are smart to be retaking just to see if you can bump it up a tad, especially given that your class rank is just out of that mid-50 range. UMN will use the test with the highest composite score in your admissions decision.
Your course rigor sounds fine - are those AP/IB classes you’ve referenced, or PSEO?
EC’s are good - you should follow the advice of your high school counselor as well, especially if you are MN resident. All the local GC’s should be very much in-the-know regarding the admissions criteria to the UMN colleges.
Good luck to you!