Unfortunately it’s still trial and error. Check out e.g Ovpn, Astrill, Mullvad though. You can always email and ask different providers as well. Though it’s best it you set it up before visiting China. A HK sim through Airalo or similar also works.

They have. I don’t know what people are talking about in this post. It’s bypassable easily, and the CCP won’t kill you for it. There are so many Chinese using aVPN themselves to bypass GFW