How about German private trackers?

If you are using jackett or prowlarr then filter the indexers by language and only select the german ones and try to get into them. Some will let you fill out a form to get an invite

torrentleech is pretty good. message me with your email if you want invite.

https://fmhy.pages.dev/non-english/#german a list of sites in case you don't know it. Some of those could have it