After deleting the app, the subscription stopped working in it. What to do?

If you deleted the App, how do you know the subscription stopped working?

Did you re-install the app?

If not, then how or where are trying to use the subscription then?

Usually deleting Apps does not cancel the associated subscription.

Does the subscription appear on your Apple ID?

click here ➜ If you want to find and cancel a subscription from Apple - Apple Support

Was the subscription started directly on the App's website? If so, you may need to log in in the App to the account that holds the subscription.

You might need to restore the subscription from within the App.

click here ➜ If you can't find or use your in-app purchases - Apple Support