I saw a thread in this board not that long ago asking what people thought was an acceptable level for a House Edge and while there was some discussion the consensus seemed to be in the 3% to 5% band as an acceptable House Edge
I'm ok with that percentage, there's still gambler who's going to win jackpot on that percentage, but the longer you play the house edge will play a big factor, best strategy is to always shift gear refresh or go for other games then comeback later I find success on this,