So, you're probably wondering how to actually deactivate your account. It's simple: just click on "Settings" and then "Delete Account". You'll be asked to enter your phone number to confirm, but don't stress, it's just a formality!
Now, you might be thinking, "What about all my chats and data?" Relax, Telegram's got you covered! When you deactivate, all your data will be deleted, and you'll be starting fresh.