I have to deal with this on several computers and it always amazes me just how messy it is, and how many files are held open whilst the WeChat client is logged in (it's in the local user folders and OneDrive creates sync errors for the many open files).

Is there actually any unique content on your desktop device? Would it just be easier to either delete the maze of locally synced WeChat files, or just uninstall WeChat desktop and start again?