“Which server do I join?” seems to be a sticking point for a lot of people.
The “Browse servers” page does say at the top “You can access all content in the lemmyverse from any server, so it doesn’t matter which one you choose”, but on showing this page you immediately scroll that message off the screen. Maybe if you kept that bit visible it would help.
Also I think comparing it with email servers might be helpful. People already know they can email anyone from any email server, and that signing up to, say, Posteo, doesn’t mean you can only email other Posteo users.
Oh, I can do project management too!
Your next task is waves hands around … the thing … waves hands around some more … like the other thing … but different.