블랙프라이데이 가격으로 제가 쓰던 서비스를 이용하고 싶은데 변경 가능한가요

november 1st is beyond the 1 week trial period so no, i don't think you can change it.  but if you "upgrade" (eg, from a monthly to an annual plan), you might be able to do so.

start at your account page and see if you can change your plan, https://accounts.adobe.com