First make your site professional, add some pages like faq and a professional homepage. Right now every visitors are striking on login page and site doesnt have any kind of content.
After you will redesign your site make professional looking ann thread for your betting platform with all the feature your platform have.
Now spend some money in advertising, provide high class support to players and try to offer good affiliate commision.
We have all this stuff it for security reason that you need a log in to go on the site if you would like to join please send me a pm to activate you and you can see