To manage/cancel your subscription please do the following:
1. Open Google Play app
2. Tap profile icon at the top right corner
3. Tap Payments & Subscriptions, then tap Subscriptions
4. Select a subscription you would like to cancel
5. Tap Cancel Subscription
6. Follow the instructions
For more detailed instructions follow https://support.google.com/googleplay/answer/7018481?hl=en&co=GENIE.Platform%3DAndroid#zippy=%2Ccancel-a-subscription-on-the-google-play-app