just go to lemmy
there are bunch of lemmy users there
a few kbinners and other fediversers too
not the original admin, but he got access right to the server
however he then lost his ssh key
I met up with some guys (and gals) from !ich_iel@feddit.org at the Chaos Communication Congress in December. They also took a group photo together that I unfortunately missed.
Some people in my local Hackerspace also use Lemmy. One of them was Admin on feddit.de before it shut down.
If you have a Hackerspace where you live, there is a good chance that some people there use Lemmy too.
edit: Hacker as in Hacker Culture or in the sense of the German Wikipedia Entry for Hacker and not in the sense of the Security Hacker
satirical wishful thinking