I have found that to get casino players, you must always promote. That’s why I sold my casino sites.
On the other hand, sports betting is more difficult to get players. However, once you get them, they do bet.
What you might try doing is promoting sports betting and add a section on your site that promotes casinos. Alot of people are finding their incomes have been reduced that promote casinos.
I also suggest that you try SEO (It has really hepled me when I re did my site) as well as manual traffic exchanges).