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I had good luck with LetsVPN on China this past April.
I had Astrill VPN as a backup but it was SLOOOW.
Make sure you have a western cell phone plan or eSIM – what you use through these services are not blocked.
As an added backup (because I was working while in China), I used a Remote Desktop app to access my US computer to actually work.
The Wifi in the hotels was very slow, and using Remote Desktop while clunky was actually a better and faster experience.
Hope that helps.