You may need to create a 'second (admin) user account' to set up new or changed configuration
that now does not work in China ~ & then re-set to original settings the first one you started with.
• How to test an issue in another user account on your Mac - Apple Support
https://support.apple.com/en-us/HT204443
This may only serve to test the theory that something there in China may not like your VPH.
Other settings may affect your ability to connect to internet -- to include local blocking, etc.
Simple troubleshooting may alleviate the issue behind this, too. Have you tried Safe mode startup?
Other resets may (or not) help. ~ Problematic symptoms are hard to distinguish from actual issues.
• Use safe mode to isolate issues with your Mac - Apple Support
https://support.apple.com/en-us/HT201262
• Check for Wi-Fi issues using your Mac - Apple Support
https://support.apple.com/en-us/HT202663
• How to troubleshoot Wi-Fi connectivity - Apple Support
https://support.apple.com/en-us/HT202222
• How to fix Wi-Fi not working problems on Mac - MacWorld UK
https://www.macworld.co.uk/how-to/mac/fix-wifi-problems-mac-3605043/
