the formula for pofit / loss in forex is below
the amount of profit you make = the amount of risk you take
So if you take risk of 100% capital you can make 100% profit, then the strategy is you should make 200-300% profit in a month to cover a 100% loss.
meaning there is no strategy that always gives profit, if one is profitable , it will have loss in same ration, the goal is always to keep loss less than profit.