Personally for me the Hi lo game gambling is just for fun sakes
That's what it is all about, it is entertainment. There's no point trying to come up with winning strategies. If you bet too frequently then the variance decreases and the house edge stands a higher chance of winning. If you just gamble occasionally for fun then you may well get lucky and win. Put auto bet away, start with a decent bankroll, make fewer larger bets and just roll with it. I usually find that people who obsess about finding the lowest house edge actually believe that gambling on random numbers is a viable way to guarantee a profit. That might be possible in PvP poker or even sports betting but not against an RNG.
So you just play from time to time for fun with a reasonable bet compared to your balance, and thus manage not to lose too much satoshis there. That's it?
I've tried to use bonus they gave, but always ended up losing all, including the amount they took from my balance.