Hello @To_Pe
You could submit the request from TP-Link account deletion portal as the instruction below. The portal was made for our users that wish to completely delete their account at their convenience, but it is important to understand that deleting your account using this portal will remove all data connected to your account and will prevent you from accessing any information associated with it.
More information about this process can be found at our FAQ here:
How Can I Delete My TP-Link Cloud Account?