Your technique on when to know to stop is very risky. You can even lose a lot before knowing that you need to stop. Why not try to lower that streak of losing even for 3 times. Because 6 times is quite high and I really find hard when you have this type of strategy or the best thing is that we need to stop for the rest of day as you mentioned.
Every time we gamble, that requires a strategy and we have to fully implement that to avoid losing big and take the opportunity to stop winning when lucky.
Making bankroll as basis is a good way to know when to stop. Depending on how much you are willing to lose but I know that there are a lot of ways to know when to stop. But most of the gamblers here are just stopping when they don't have bitcoin to gamble anymore.