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

Username	Date	Post Link	Relevance	Offered Matches	Sought Matches
u/capybaraanon1	2022-01-15	Post	`7`	English (B2)	English, Portuguese
u/yeorgenson	2022-03-26	Post	`5`	English	Portuguese
u/annualput3782	2022-03-13	Post	`5`	English	English
u/uzakobabazako	2022-01-03	Post	`5`	English (B2)	English
u/englebondhumperstonk	2022-01-06	Post	`5`	English (Native)	Portuguese

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