...Savoir says that many think they are unprofitable because of the psychology, when in reality they lack a profitable trading system/strategy/process, which is hard to make, takes a long time to learn and is hard to develop.
The core to profitable trading is a well-developed process/strategy that you fully trust in. Then once you have that, the psychological part is to focus on the process and execute. You have to be mindful, in the present moment, fully focused on executing the process. If you are focused on the now, you can't be thinking of past mistakes and regrets, not thinking about the future profits, but fully immersed into what you can do now and take control of the things that you can control(execution of the strategy).
By focusing on the process is how you take yourself, your ego, emotions,.... out of the equation.
BUT you do need a profitable strategy that you fully trust. If you don't have one, it might seem like you are in a loop where bad things continue to happen to you and then it would be only normal to get emotional, angry, frustrated, miserable,...
That's true in many situations but on the flip side...
I've seen many traders backtest their trade strategy that show positive expectancy and then simulate their trade strategy that show consistent profits.
Yet, as soon as real money is on the line...the traders eventually mentally fall apart. They're not profitable.
Unfortunately, they then believe its the strategy fault...nothing wrong with them (their psychology). They then make the mistake of tinkering, changing their trade strategy to make it even better in hopes that it will inspire their psychology to follow the trading plan.
wrbtrader

