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

Username	Date	Post Link	Relevance	Offered Matches	Sought Matches
u/mzungungangari	2021-10-24	Post	`5`	English	Portuguese
u/thecontr0lfreak	2021-11-08	Post	`5`	English (Native)	Portuguese
u/bloobear_9_gal	2021-10-19	Post	`5`	English (Native)	Portuguese
u/coach_xav	2021-10-06	Post	`5`	English	Portuguese
u/mrjr9848	2021-09-18	Post	`5`	English	Portuguese

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