Nick, thanks for posting your question about canceling your new subscription to this public discussion forum. Please see https://adobe.ly/4bzEvzi for steps you can take to complete the cancellation process. You can find more information on the timeline of any fees, charges, and refunds at https://adobe.ly/3F6p1XI. ^JW
p.s. if you're contacted by anyone (via email or private message), it's much more likely to be a scammer than an adobe representative.
if you're unable to follow the steps described, you'll need to await help from an adobe employee for the next step. (if you don't get a reply here from a badged employee within 24 hours, repost.)