As of January 30, 2022, you can easily delete your account by going to Profile → Edit Profile → Navigation → Delete profile → Delete
- Click on your Avatar or display icon to enter your profile page.
- Click on the Edit profile button.
- Go to the Site Settings column.
- Select Delete Profile.
- Accept the conditions and click on Delete.
Alternatively, you can quickly go to this link and apply for deletion.
Note: There is a 24 hour grace period to cancel your deletion.
N.B: Deletion of an account is not a complete deletion. To prevent spammers Stack Exchange stores some information about the users even after the account deletion.