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

Do you guys have any good suggestions to save novice Huiyou like me from taking some detours?

My usual trading system continues to fail, what should I do?

If a trading system built by myself often fails and causes losses, should I abandon this system and replace it with another one? Is there a stable and profitable trading system?

Everyone talks about whether the news is bullish or bearish. Why does the market still go in the opposite direction?

What is a perfect trading system? Or is there a so-called perfect trading system?

What do you think is the most important thing in trading?