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

Username	Date	Post Link	Relevance	Offered Matches	Sought Matches
u/lionbab	2023-11-08	Post	`8`	German, English	Portuguese
u/grouchy-fee-8725	2024-01-29	Post	`8`	German, English (Native)	Portuguese
u/fleischwors	2023-11-07	Post	`6`	German (Native), English (C1)	---
u/necessary-giraffe670	2023-11-09	Post	`6`	German (Native), English (C1)	---
u/metraq	2023-11-11	Post	`6`	German, English	---

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