Usually it's one of these, roughly in this order:
Open one.google.com/storage/management on your phone or computer, or go to the Google One app and tap Storage.
Gmail's search box can find space-hogging emails in seconds. Type any of these into the search bar, select all results and delete.
Open WhatsApp, go to Settings, Chats, Chat backup. Turn off Include videos if it's on.
If you've cleaned up and still need more than 15 GB, a Google One plan is the simple fix.
Fraudsters send emails and SMS saying "Your cloud storage is full, your photos will be deleted today" with a link to pay.
Google Storage Full? How to Free Up Space in Gmail, Drive and Photos
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