What subscription do you want to cancel? Do you mean your TurboTax Advantage subscription? If so, see the following FAQ.
How do I cancel my TurboTax Advantage subscription?
See this info
https://ttlc.intuit.com/turbotax-support/en-us/help-article/change-service-level/cancel-turbotax-advantage-subscription/L4UBBY0Th_US_en_US?uid=lphujzvj