Where is my network route set wrong? But the previous players can search and immediately connect to the server to play, but the new players just can't search the connection. I instructed them to press refresh all... :'(This problem has been bothering me for a long time

You can consider me a new player and I can join it just fine. I've tried from two different accounts and two different IP addresses.
The international network routing is never perfect. Some players will be unable to join certain servers sometimes simply because intermediate Level3 providers may have issues. I'm speaking from our experience hosting many servers over years.
AND There is another problem, I modified the server title and saved it, <-- Server name. Please keep it short (max 64 chars) -->
< name > xxxxxxxxx < / name >, but he did not display the title I changed, but continued to display the original title 
You need to restart the server in order to apply any changes made to any settings files.
Regards!