Exactly. When I started, I tried running the algorithm on portfolio of currencies, but the correlation between them caused my account to blow up completely. But this is part of the learning curve so in a way I was "happy" that it occurred. Since then, I am only trading EURUSD and using the market volatility as a confirmation signal before making a trade.
Also here you're absolutely right. I am not using martingale at all, it's a matter of time until an account will blow up when you're using this method of closing losing positions. Still, I am holding on to losing positions until my algorithm tells me that the trend is over.
Those who invested in my algorithm when it was commercially ready, made over 50%, and those with the 1:4 leverage made 200%+... a good friend of mine financed his wedding
So I am happy to take any question / critic about my algorithm, but I would appreciate if it's a fair one and not like "it's bad" bla bla.
Good luck to everyone and happy trading!