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

Username	Date	Post Link	Relevance	Offered Matches	Sought Matches
u/turbulentvillage4169	2023-04-11	Post	`5`	English (C2)	Portuguese
u/ecmcknight	2023-04-16	Post	`5`	English (Native)	Portuguese
u/hermy_xoa	2023-03-21	Post	`5`	English	Portuguese
u/aidan2897	2023-05-05	Post	`5`	English	Portuguese
u/cherryflores	2023-02-22	Post	`5`	English (Native)	Portuguese

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