The fourth point will automatically make you a good trader. Trading is difficult because it requires experience and practise over a period of time, and not many traders are capable of that. One of the best ways to progress in trading is to maintain a trading journal. Once you backtest your trades, you understand the fallacies in your trading. Improving them can be helpful in strategizing your future trades.
I think it’s always important to learn from all your mistakes because that will prevent you from committing the same mistakes again and eventually help you grow to be a profitable trader. And yes, having a trading journal can be very helpful once your a trader. And with continuous knowledge and experience, you will become skilled in trading industry.
However, I believe trading also is not for everyone no matter how you tried learning it and gain experiences. So once you’re into trading, you should also learn to know your limits if you think you are not profitable anymore.