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

Username	Date	Post Link	Relevance	Offered Matches	Sought Matches
u/queenbaluli	2021-12-15	Post	`10`	English, Polish	English, Russian
u/thirdtimereg	2021-11-05	Post	`8`	English, Polish (Native)	Russian
u/depressedaxolotl	2021-12-01	Post	`8`	English, Polish	Russian
u/throweythroweywahey	2021-12-06	Post	`8`	English (C2), Polish (C2)	Russian
u/restart00	2022-01-08	Post	`8`	English, Polish	English

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