Trading Strategies are not constant , it changes with time. If we think the particular method we were taught in the early stages during trading will still work for the market over time, we may keep on losing because the market changes with time. One particular strategy of trading can't be use all the time.
Getting the best strategy doesn't gurantee you hugh profits in trading but can help reduce the loss rate and also helps select the best method for a particular trade. For me, I normally use Support and Resistance all time because it was one of the tip that was easier and simple to apply on charts pattern. But with time I realized that would not help me for long, so I went deeper to study fully how to make good use of trend lines on the chart. Although not all strategy last for long, it all depends on how to use that strategy to execute on the trade.