Well, sticking to your strategies that seem effective is perhaps a great idea but sometimes we need also to try new strategy(ies) because we never know if are more effective. Because I know is that trading is an every day learning and surely we learn new things in every situation that we encounter, especially when facing difficult times. And this time, we just see the importance of deeloping another strategies and will suits to the current situation that we never face before (like 2 years ago).
We can relate trading as a football team and I think one of the strategy of the game is that you don't necessarily change a winning team because if you do something you think you want to perfect may go wrong. Trading like you said is not easy and having a winning strategy is better to stick with it. If you think the grass is greener with another new strategy then you may be disappointed. Trading is about profit taking and not a show of perfection.