Manage your Google Account.
Data & personalizationin the left menu (or
Manage your data & personalizationin the Privacy & personalization section).
Download, delete or make a plan for your dataand click
Delete a service or your account.
Delete your accountbutton.
download your dataand save the necessary data to your disk.
Before you delete an account, think about whether your email account, Netflix, Steam, and other services
are connected to your email. Restoring access to services after deleting an email is a very hectic task.
So if you have realized that you don't need the email, we strongly recommend you double-check everything, not to use it for a while, and then remove it.