1 - Enable two-factor authentication and a passcode. Go to Settings → Privacy → Cloud Password → Set Password. Then go back and select Passcode & Face ID.
2 - Configure auto-deletion of data.If you haven't logged into Telegram for a while, you can set up automatic deletion of all data after a certain period. Go to Settings → Privacy → If I Don't Log In → select the desired period.
Don't forget about cybersecurity and stay vigilant!