I'm afraid I'm still on reddit quite a bit. Most communities have a lot more activity there. Rust, nixos, luthiery, local and state level subreddits. r/fiddle, and other instrument subreddits have more activity.
That said theres a lot of chaff that I wouldn't miss. r/sysadmins is all removed about corporate work, r/machinists the same but blue collar. r/hiking is all shoe posts and gear. Political subreddits have lots of activity but its 90% rage farming.
Technical communities are strong on lemmy, despite their smaller size. And its refreshing to read the super far left diatribes, I don't get that stuff elsewhere.
nixos/nixpkgs