As mentioned earlier, give the banners a more prominent position, but I guess it is template, so maybe not so easy to change, so maybe looking into changing the template.
Also, in your opening texts, where you now write about Bayern Munich v Lyon you should have some text links to some operators there. I see that more people click on text links if they are interested in the things you are writing, and they believe you they will click on a link, sign up and make a bet.
Also as mentoned by Shotgunpete, try to add a oddscomparison feature or something like that. Or a xml feed from the best converting site.
If you are having any email subscribers, I can give you a €5 free bet, just for players to sign up with.
Good luck!