I am surprised that whenever I see posts like this, sharing tips on trading, they never mention the necessity of emotion control. Despite having the best strategy, if you fail to control your own emotions, that strategy will not work out in the end. Your strategy tells you that this price will go up and suddenly it goes down. You get panicked and make a decision based on emotion and close the trade in fear or panic. But after some time, the price moves the way it was predicted according to the strategy. This is how dangerous it is to fall victim to emotion.
This is also the reason why you need to have control over your emotion and a strong mindset to follow the rules till the end.