You can try to snipe the host, which basically means try him when he is rolling a lot of high numbers, and hope his streak continues, or a lot of low numbers hoping his streak will end. Good luck!
Like Awesome said, you could try snipe a 55x2 host, or continuosly bet a host over and over starting at like 500k, if you lose, you bet 1500k, if you lose again, you bet 4500k, just keep 3x your bet and when you win, you win back your cash +m more.