If you want to delete your account - you should press the "Suspend profile" link in your Gaijin.net store profile
You will receive a confirmation letter to your registration e-mail to delete(suspend) the account
After following the instructions from the letter, your account will be suspebded.
To restore the access to your account, you need to submit a support request using this link: https://support.gaijin.net/hc/en/requests/new.
In the request, be sure to specify the email of the account you wish to restore.