Stop my iTunes subscriptions

This is primarily a user-to-user support forum; other Apple users like you. We cannot cancel subscription for you but the following instructions may help:

There is an Apple article that explains how to cancel subscriptions. Click on the following link: If you want to cancel a subscription from Apple - Apple Support

and

Cancel upgraded iCloud storage by downgrading to the free 5GB plan. See instructions in the following Apple article: Downgrade or cancel your iCloud+ plan - Apple Support