It’s a nice theme. Just the header looks a bit unfinished, i would customize it more. Maybe more visible banners. But from my point of view i wouldn’t say that your actual number of visits is because of this. If I were you i would :
– Define a competitive set of keywords orientated to your domain (take into consideration that there are some hard keywords to compete like “slots” or “casinos”, some times is better to focus os small phrases)
– Get a few of quality backlinks
– Have a great content.
Then visits for sure will grow. After that if the number of returning visitors is bad, it worth spending some time doing “complex” theme customizations.
Just a point of view.
Cheers.