Sign in to your Google Account
Go to Google Account settings
Select Data and privacy
Scroll to Data from apps and services you use
Click Delete a Google service
Enter your password if prompted
Find Gmail and click the delete icon
Enter a new email address for sign-in if required
Verify the new email address
Follow the on-screen steps to confirm deletion
Review the warning about losing Gmail data
Confirm deletion of Gmail
Keep using other Google services with the same account if desired