How to build a reliable trend trading system? Let's discuss

What should I do if my trading system encounters a retracement?

I have had a few positions liquidated recently, but fortunately the losses were not very large. I would like to ask everyone, is there any way to prevent liquidation? Is there any trading discipline?

How do you view the theory that review is useless?

What would you say to yourself if you went back to your first day in trading?

Do you think EA will be a market trend?