I agree with lindagaf. Do not write about why wustl isn’t a good fit…you have to have a solid why us? essay for transferring to a new school, preferably an academic reason. Certainly during the pandemic, living closer to home could be a good reason as well. But you should not mention leaving WUSTL for the social scene, or food, or lack of school spirit.
Certainly apply for spring transfers where it is an option, but it can’t hurt to ask if there is any opportunity for this fall…some schools may unexpectedly have openings once they communicate their fall plans. It’s likely the selective schools have enough transfer apps in the queue, but again, doesn’t hurt to ask.