Add more security features like a fingerprint scanner and 2FA

Add an option to require fingerprint/biometric scanning or code input before the app can be accessed.

For logging into your account, have an option for 2FA or multi-factor authentication

Additional Security Features:

1) Two Factor Authentication via Authentication codes sent via Email/Authentication App such as Authy, Google Authenticator etc.

2) Single User-Session Restriction where only one device [regardless of device type and access mode] could access the account at one time. Any new login would be alerted via email and the previous session would automatically be terminated right immediately.