it is indeed true that there is no single strategy that will always give you wins. as we all know that forex is a game of probabilities. All we are trying to do is being on the high probability side and make money out of it. In my opinion, there is actually much more available to us to trade than what is required. What i am referring to is that there are so many indicators, literally in thousands. Seriously guys, we don't need so many indicators to trade. Trading in my opinion is fairly simple and we only lose when we try to make it complicated. The more simpler your set up and strategy is, the more chances of success.
Even the simplest strategy like "buy if this week's close is higher than previous week's close and sell if this week's close is lower than previous week's close", will make money, and that too, compared to those highly complex strategies out there. Then why do we lose?