There are several ways to improve the security of your Coinbase account. First, you must use a strong password. A strong password is usually a combination of uppercase and lowercase letters, numbers, and special characters. It would be best if you also considered adding security keys—regarded as the most potent form of two-step verification to your Coinbase account. A popular security key is Yubico. But suppose you don't want to use security keys just yet. In that case, the closest security option is TOTP (Time-based One Time Password). TOTP uses a mobile authenticator app like Google authenticator or Duo. Above all, always secure your email.