Considering that Strikingly account is fairly critical for us (our public facing website stands here), we'd like to secure it by adding a 2 factor authentication.
2FA is already an industry standard now, and is critical, since just passwords are not secure (especially since users tend to reuse passwords or in some other ways leave it open to guess/hacking) - this means that security vulnerabilities of even other sites could potentially compromise your account on a relatively secure site (if your passwords are even remotely related).
There are many ways to implement a 2FA, including a mobile OTP, or a 2FA app integration. Relatively cheap software such as Sendy also implements it, so I really hope Strikingly does it too.