Sign in to your Google Account
Go to your Google Account settings
Select Data & privacy
Scroll to Data from apps and services you use
Click Delete a Google service
Sign in again if prompted
Find Gmail and click the delete icon
Enter an email address that is not Gmail to use with other Google services
Verify the address
Follow the on-screen instructions
Confirm deletion of Gmail
Save any important emails before deleting
Update any accounts that use your Gmail address
Remove Gmail from recovery options if needed