Users who created their Piere account natively (with a phone number and password) currently have no way to add multi-factor authentication (MFA) or switch to a more secure login method such as Google SSO. It would be valuable to support: (1) MFA/2FA for native accounts (e.g. via authenticator app or SMS), and (2) the ability to link or migrate a native account to a Google or Apple SSO login. This would improve account security for users who prefer not to rely solely on a password-based login.