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

Username	Date	Post Link	Relevance	Offered Matches	Sought Matches
u/juanomelhor	2020-11-22	Post	`5`	English	Portuguese
u/claricelispectorpe	2020-10-20	Post	`5`	English	Portuguese
u/greatwhite000	2020-08-27	Post	`5`	English (Native)	Portuguese
u/codywonton	2020-10-25	Post	`5`	English	Portuguese
u/montbau	2020-11-18	Post	`5`	English	Portuguese

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