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

Username	Date	Post Link	Relevance	Offered Matches	Sought Matches
u/kubkanoobka	2021-04-04	Post	8	Czech (Native), English	Russian
u/zuzzoush	2021-04-10	Post	8	Czech (Native), English	Russian
u/queenofhorsethieves	2021-04-30	Post	8	Czech, English	Russian
u/lacuber	2021-04-01	Post	6	Czech (Native), English (Native)	---
u/82148	2021-04-13	Post	6	Czech (Native), English (C1)	---

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

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