Hello Pat,
You should try to diversify, try to add some Rival casinos (Slotocash, Absolute Slots) if your traffic is mostly US based, they still accept usa traffic and they are very reputable programs.
Also in the meantime make a section on your website that caters for European players (UK casinos, French casinos, German casinos) and put the MG casinos into this pool. This section doesn’t need to be in foreign language, lots of players are searching english keywords, even if they want country specific casinos.
Try to use more “European” keywords (include words like UK, european, etc) and you will get non-usa traffic too this way, so you can slowly shift the usa/non-usa ratio of your player base.
If you need any help, just PM me and i’m glad to help 
Cheers
Gabi