Never been to China, but I hope my 2 cents can help either way.
If you are really worried about the content of your phone, I would wipe the phone and only go with the basics installed on it.
Otherwise, I would say, don't bother making your phone overly complicated, just uninstall things you think could be sensible, here's why I think that is a valid option:
I was always of the belief that if you go to China, they are gonna ask you for your phone and password, and keep an eye on you.
Very recently, multiple people I know personally went to China to visit, including one person married to a Chinese citizen and as such, goes regularly there.
Naturally I have asked all of them by curiosity, if it was really as bad as what people say, they all answered the same thing; None of them felt like their privacy was being invaded at any point during the trip.
Obviously, it's extremely likely that you are still monitored in some ways, but from what I heard from anyone that went there, the CCP doesn't really care much about you because you are a random foreigner, and also, they actually would like a lot of people to visit the country, so they're trying not to be too hostile to foreigners.
So really most likely what you should be expecting is the level of monitoring that's done in every country nowadays.