After selecting a reason, you'll see a warning that your account will be deleted along with all your messages, contacts, and groups. If you're sure about deleting your account, click on the "Delete My Account" button. Your account will be permanently deleted, and you won't be able to retrieve any of your data.
How to Delete Telegram Account Permanently in Easy Steps
It's worth noting that deleting your Telegram account is a permanent process, and you won't be able to recover your account or any of your data. If you're unsure about deleting your account, you can consider deactivating it instead, which will temporarily suspend your account. This way, you can reactivate it later if you change your mind.