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

Username	Date	Post Link	Relevance	Offered Matches	Sought Matches
u/mekouyenbar	2020-12-08	Post	`7`	French (Native)	German, English
u/randomredditor314159	2021-02-02	Post	`7`	French	German, English
u/yenk67	2021-01-08	Post	`7`	French (Native)	German, English
u/rola7013	2021-01-29	Post	`7`	French (C1)	German, English
u/orionisbeta	2021-02-02	Post	`7`	French	German, English

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