To permanently close your WordPress.com account, tap on your profile image in the bottom right corner.
Then tap Account Settings.
Then, you can permanently close your WordPress.com account from the bottom of your Account Settings screen.
If you have a WordPress.com plan or other upgrade, such as a domain, you must cancel all active purchases before closing your account. This can be done in the Purchases area of your account from a web browser. Visit this guide for step-by-step instructions:
https://wordpress.com/support/manage-purchases
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Please note that deleting your account will delete all sites associated with it, and the username is blocked from being registered again.