Get rid of passwords altogether by using two-factor authorization. Install an app on your phone and use it to pair your smartphone to your site, automatically log in from trusted devices, and block everyone else.
If a user logs in from two devices at the same time, then they will be bounced to a login warning, stopping users from sharing their login information with others. Works automatically with several rounds of detection.
Provides security for your WordPress site, scanning your install for vulnerabilities and fixing them automatically. It also backups your site several times a day, so that you can restore it with a click of a button.
Hide your entire WordPress site behind password protection. Any users visiting your site will be greeted by a login page which prompts them for a password that you specify.
Gives you a list of security tweaks that you can make for your website in a variety of different categories. Also performs regular database backups in case the worst happens and you need to restore everything.