I found the following users who may fit your language exchange criteria:

Username	Date	Post Link	Relevance	Offered Matches	Sought Matches
u/_spaceberry	2021-04-16	Post	`5`	English (C1)	Chinese
u/esmegrelda	2021-03-11	Post	`5`	English (Native)	Chinese
u/lexalin	2021-03-29	Post	`5`	English	Chinese
u/background-ganache94	2021-05-03	Post	`5`	English	Chinese
u/689403185	2021-04-28	Post	`5`	English	Chinese

Please feel free to comment on the above posts to get in contact with their authors.