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

Username	Date	Post Link	Relevance	Offered Matches	Sought Matches
u/gvdvev	2024-01-19	Post	`7`	English (C1)	Arabic, German
u/daoken	2024-02-26	Post	`7`	English (C1)	Arabic, German
u/too_fucking_bored	2024-02-26	Post	`7`	English (Native)	Arabic, German
u/saul-goodman-3	2024-03-02	Post	`7`	English (C1)	Arabic, German
u/j7_hi	2024-01-29	Post	`5`	English	German

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