When you use Bitwarden as a password manager, enable 2FA.
Pro tip: When you setup 2FA with at least two methods/devices, disable the email 2FA that is enabled by default after setting up 2FA.
If you look for a TOTP app, check AndOTP on f-droid as it allows you encrypted backups of the material.
Otherwise, buy a Yubikey and use the U2F-method. which is the most secure option.