Unfortunately, domains cannot be deleted until it expires. You may leave the domain as it is until it expires if you do not want to use your domain.
Domain Names cannot be removed/deleted. Once a Domain is registered it remains active until it's expiration date. Once the expiration date is reached, the domain will be deleted some time later after the Grace/Redemption period is ended.
*Kindly ensure your automatic renewal is set to OFF so that the domain will not be renewed.
