Thank you for posting, @easygoing_person537d.
Thanks for reaching out, and I apologize for any confusion in the signup process. I can see that your Lightroom subscription was purchased through the Mac App Store.
Because Apple manages billing and subscriptions purchased through the App Store, you'll need to manage the subscription directly through your Apple account. This Apple document explains how to view, change, or cancel App Store subscriptions:
https://support.apple.com/en-us/118428
If you recently subscribed to the wrong plan and would like to review your available options, I'd recommend starting by checking your subscription in your Apple account and following Apple's guidance.
Please update this public discussion thread if you have any additional questions, @easygoing_person537d.