To delete your Google account, log in to your account and go to data and personalisation and click “Delete your account” form the “Delete a service or account” section.
Here are the steps in detail to delete your Google account.
Go to google.com and sign in to the account that you would like to delete.
Click on your profile picture and select “Manage your Google Account”
In the accounts settings page, navigate to the “Data & Personalisation” section.
Click “Delete a service or your account”
Now click “Delete your account” from Delete a service or your account section.
You have successfully deleted your Google account.