First, WC Boro will not let you obtain a student rental permit to make it more attractive to a prospective investor. Either you have one or you don't, and if you are using it as a primary residence for over a year, it is now considered a residence, even if you once did have a student permit ..
The fact that you've had 40 showings indicates that it is well marketed and has good online appeal. If your agent uses eshowings or the like, they should be able to provide you with a full feedback history. ask for the unfiltered version.
Looks from the date that you were on the market in the thick of summer, which isn't always the best time of year.
Double check all the loose ends, objectionable items, and make sure you are staged to sell. Is there a pet odor or cigarette odor? Sometimes agents aren't comfortable leaving that type of feedback, and that can be a big turn off to prospective buyers.