Try out
stake that’s were most of the high rollers reside, and they have been known for massive and high payouts too.
Stake isnt allowing me to register from my country, is VPN allowed to use over there?
if your country is restricted on stake.com, it's better to look for another casino that fits all your needs, do not use a VPN just to bypass their restriction, you are just going to risk losing your money by getting banned. you can try visiting
BTCGOSU(a review site created by a forum member here), if I remember correctly they have a category for "high roller casinos" you might find casinos there that don't restrict your country and allow you to bet 5-10k per bet.