Let me move this to the Account, Payment, & Plan forum for you, which is the appropriate forum for your question.
The Using the Community forum is for help in using the Adobe Support Community forums, not for help with specific programs. Product questions should be posted in the associated product community.
There is no way to turn off the automatic renewal. You will need to set a reminder for yourself to cancel it manually during the last month of the subscription or cancel early and pay the cancellation fee.