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

Username	Date	Post Link	Relevance	Offered Matches	Sought Matches
u/kasimirquasimort	2020-07-06	Post	`11`	German, English, French	Russian
u/cyms_	2020-07-15	Post	`10`	English (C1), French (Native)	English, Russian
u/apmcsl	2020-07-19	Post	`10`	German (Native), English (C1)	English, Russian
u/lafruit	2020-06-08	Post	`9`	German, English, French	---
u/enochthe2	2020-07-21	Post	`9`	German, English, French	---