You can cancel your subscription at any time by going to the Store's settings on your device.
For Apple, please follow the instructions at this address :
https://support.apple.com/fr-fr/HT202039
For Android, please follow the instructions at this address:
https://support.google.com/googleplay/answer/7018481?co=GENIE.Platform%3DAndroid&hl=fr
On the website, go to "My Account" then disable the automatic renewal of your subscription.