I noticed that we are lacking the equivalent of the r/sysadmin community on Lemmy. It seems like there is one community that is reasonably sized but it is still pretty small.
https://lemmy.world/c/sysadmin (!sysadmin@lemmy.world)
For those you do not know, Lemmy is a kind of federated forms. It is like Reddit but unlike Reddit the content is spread out across multiple instances that federate with each other so that a user on instance a can access a community on instance b. You also can use Mastodon with it as they both use ActivityPub.