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

Username	Date	Post Link	Relevance	Offered Matches	Sought Matches
u/alexsamikr	2022-03-04	Post	10	Arabic, French	English, Italian
u/mrshm_huang	2022-03-20	Post	10	Japanese, Chinese	English, Italian
u/moritzowitsch	2022-05-12	Post	10	German (Native), French	English, Italian
u/iarefunny	2022-03-13	Post	9	Arabic (Native), German, French	---
u/samoyedwitch	2022-03-08	Post	8	Japanese, Chinese (Native)	English

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}

Hi! I am a Chinese native speaker. My English and German have also reached C1, but my oral English and German is not quite well. If your major is related to Engineering, I can also help with some courses. I just wanna to practice speaking skills. Therefore it would be much better if we have common topic to talk about.