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.
Yes of course trading strategies must constantly change with time. You can never trade on a trading platform with one strategy Use that technique when and where it needs to be used.The market will move at different speeds and you should also move when you reach that market.If you can trade with different strategies then you can get acceptance as a good trader.