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

Username	Date	Post Link	Relevance	Offered Matches	Sought Matches
u/richardseven	2022-11-16	Post	8	English, Polish	Russian
u/fgosiekuck	2022-11-16	Post	8	English (C2), Polish (Native)	Russian
u/jcuwjcjjkwkdkgjuek	2022-08-30	Post	6	English, Polish	---
u/wrumwrumwrum55	2022-09-02	Post	6	English (C2), Polish	---
u/luciferthetruck	2022-09-05	Post	6	English, Polish	---

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

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