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

Username	Date	Post Link	Relevance	Offered Matches	Sought Matches
u/nothereortherexin	2021-03-07	Post	`5`	English	Polish
u/aelnir	2021-05-10	Post	`5`	English (Native)	Polish
u/madoinheben	2021-05-25	Post	`5`	English	Polish
u/grinianii	2021-03-07	Post	`5`	English	Polish
u/iaia99	2021-04-01	Post	`5`	English (C1)	Polish

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