Open Google One or your Google Account storage page
Check what is using space: Gmail, Google Drive, and Google Photos
Delete large emails and empty the Spam and Trash folders in Gmail
Remove large files from Google Drive and empty Drive trash
Delete unwanted photos and videos from Google Photos
Empty the Google Photos trash
Review and delete backups in Google Drive if needed
Clear app data stored in Google Drive from old devices
Use Google One storage management tools to find large items
Delete files permanently from Trash after reviewing them
Buy more storage if you still need additional space