Below is the thread of german torrent trackers. Part of the table is cut off on mobile so I recommend switching to desktop site.

I suggest trying to enter Immortuos, TNTracker, and RocketHD. Seedpool is great for 0-day German scene content, but it's an international tracker.

IM is worth a try but they need proofs and will likely tell you to wait a few months for more assccount age (e.g. minimum half a year or so).

TNT is easy to get an invite for, if your somewhat active in a community where you know people are on TNT.

AnimeWorld is the best for anime and typically does open sign ups around new year.

RocketHD is an upcoming tracker which is better than the stats suggest. Also it's improving quickly with an active community. It's the only German tracker with an invite path (through MAM).

TS is the best. But unless you've been active for years with great (!) (international) proofs it's impossible to get into.

https://www.sb-innovation.de/showthread.php?35824-Liste-aktueller-deutscher-Torrent-Tracker-V2

Edit: If you're in Germany you must bind your torrent client to your VPN. Else it'll be an expensive lesson.