well.. martingale works always but it depends on your balance and of course on gambling site

if you have good bankroll management it and play trusted Provably fair gambling site it will work

but its always to invent some good your own strategy (depending on Site you play)

good luck with it mate

You are wrong. Martingale not always works, yes it works sometimes but when the long losing streak comes it will bust your bankroll for a few satoshi return by your basebet