There are a number of improvements that I would recommend. Firstly, update your site to utilize best practices in today's design standards -- including a mobile-friend, responsive design.

While doing this, I would recommend you migrate to a content management platform like WordPress. In doing so, you can easily incorporate social logins, like you originally asked.

Your current platform has some inherent characteristics that will hold you back from "the next level".

I'd be happy to discuss more - feel free to book a call here on Clarity and I can get into specifics.

-Shaun