Do only 50% bet 20$ every time if it fails do 60$ it fails do 150$ if it fails do 350$ if it fails do 900$ if it fails do 2300$
There is no way you will fail 7 times and if you do just increase the bet and you will get it back eventually even if you wait 12 times.
what you think on my method?
Martingale strategy? You think people haven't thought of this? Lol, sure they have and this is how they lost everything. In the long run, no matter what strategy you use, the casino will always win.
And for your strategy to work, you will need infinite balance or you won't eventually be able to place bets since you will lose everything. And if you had infinite balance, why would you want to gamble?