I'm seeking to know if having a personal trading strategy has been able to enhance your trading profitablity and if you really keep to a particular strategy that worked for you even when it seems it's failing you later on and for how long do you stick to this strategy?
You can not conclude one strategy is bad if you are not able to control yourself (emotion then decisions with entry, exit price and time to enter as well as time to exit).
You can not conclude one strategy is good if you only apply it a few days, a few weeks and see you are in profit temporarily. Because market will likely take all temporary profit away if you can not close your position at right time especially before big movements.
Personally, one strategy is considered as good if you obey all your own rules for that strategy, and you have net profit or net loss after more than 3 months. If after 3 months, it is good, you can continue to apply it in next 3 months. If net result after all 6 months is good enough, that strategy is good to use, at least for yourself.
Even if it is good, you should never put all capital into one account that is used by one strategy. Trading is risky than investment so you should use very few part of capital for trading.