The best way to add more security to your Modrinth account is to set up two-factor authentication (2FA). Modrinth's 2FA setup uses time-based one-time passwords (TOTP), which can be generated through Google Authenticator, Authy, Bitwarden, or any other application supporting TOTP 2FA. You can set this up under the "Account security" section of the Modrinth account settings.

Make sure to save the given backup codes in a secure place! Without them, you will not be able to recover your account if you lose access to your authenticator.