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

Username	Date	Post Link	Relevance	Offered Matches	Sought Matches
u/klucafx	2021-09-09	Post	5	Greek (B1)	English
u/blas_p_hemie	2021-06-25	Post	3	Greek (C1)	---
u/deminio	2021-07-24	Post	3	Greek (Native)	---
u/84d8r41ns	2021-07-24	Post	3	Greek	---
u/zcev	2021-07-24	Post	3	Greek (C2)	---

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

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^{Hermes: a bot for r/Language_Exchange | Documentation}