Why is Emotional control one of the most difficult things to do while trading!
This is simply because we are human beings, and so long as blood flows in our veins, we have a high tendency to be emotional. This will be aggravated if we are too protective of the funds, especially if we use the money we can't afford to lose for trading which is against trading rules.
Each time I make profit, I feel like it's all due to my expertise but if I apply the same strategy I also might end up loosing and sometimes I do get carried away and begin to trade with luck and then end up liquidating my funds.
Please how can I go about this , and what technique or strategy seems to be best for trading?
It seems to me that you are asking a question you already know its answer. You've already known your fault, so change the narrative. Only trade with your strategy and avoid gambling on luck.