You can delete your account yourself, from Profile → Account. No email to us, no waiting.
Export first if you want to keep anything — deletion is not reversible, and we cannot restore an account afterwards.
Deleting removes your training, your conversations, your notes and your profile. It also disconnects your watch, so nothing further arrives.
If what you actually want is a break rather than an ending, you do not need to delete anything: stop, and come back whenever. Nothing expires.
Where this lives in the app: User Profile