Main german Lemmy is at www.feddit.org . They have a few communities that might interest you:

!dach@feddit.org & !deutschland@feddit.org for general news !technik@feddit.org for everything about technology !geschichte@feddit.org and !die_reklame@feddit.org for history !ich_iel@feddit.org for memes

The fediverse offers a noncommercial alternative and that can be a draw. A “normal” Reddit user might not want to join us, but there will be users fed up with all the ads on Reddit, some of Reddits policies, tolerance of nazis and abuse and so on. Mastodon always was in the shadow of Twitter, a nice, but blew up when Musk started to destroy it. It offered a way out and that is worthwhile. And if Zuckerberg is starting to transform Instagram into a rightwing horror show, Pixelfed is there as an alternative. And if you want out of YouTube, PeerTube is working and ready for you.