One of the things up next on my agenda, is to re-do join-lemmy.org . We have the mockup for it done, I just need to complete it.
Also as someone who grew up before the "use this single US-based site to connect to everything", I don't see how lemmy is too different from older forums. You go to a site, click the signup button, and wait for approval / log in immediately. You don't need to know anything about activitypub, federation, or the fediverse to sign up and start using a lemmy site.