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

Username	Date	Post Link	Relevance	Offered Matches	Sought Matches
u/kmach0_0	2021-01-26	Post	`5`	English	Portuguese
u/carneconpapas	2021-02-17	Post	`5`	English	Portuguese
u/hvitto	2021-02-16	Post	`5`	English	Portuguese
u/uktobrazil	2021-03-26	Post	`5`	English (Native)	Portuguese
u/purple_parade	2021-03-22	Post	`5`	English	Portuguese

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