I'm seeking to know if having a personal trading strategy has been able to enhance your trading profitablity ?
Having your personal strategy is good because you are sure of the factors that lead to that strategy being formulated. If you are used to using other people's strategy, you will be riding mostly on trust and not certainty. This does not mean that you should completely ignore hearing other people's strategy, you can listen and learn, maybe even from listening you will have tips to make your strategy better.
... 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?
I become uncomfortable whenever my strategy fails like three time in a row. I pause and find out what is is wrong before I continue trading.
All I care about is having a good strategy that works. Whether it is personal or general one like the one we can buy from pro traders that must have developed fast working indicators or bots that give a better results. Trading is sweet when we have a strategy that works as atrader and we are earning from it. It does not matter how we get to know about the strategy because what matters is the amount of turnout we having on a weekly basis. Strategies do expire so we need to be updating it according to the market differences.