Hi, I had the same problem my ls changed to another server right after they put the page up and after 2h they where full.
That evening i tried to sign up w/o success, the next morning around 3pm jst they manually opened the servers and for like 1-2h almost all worlds where open.

You should try your luck during the week around that time, even if they don't open your desired world its more likely for you to squeeze in if there's some other worlds open for people to move around.

good luck ^^!