I think that FF14 doesn't work that way. Visiting another world is basically like hopping to another server. If that server is full, then you can't go. The same thing happens when you're returning to your world, if your world is full, then you have to wait in line like everybody else. I don't think there is a solution to this other than putting you at the front of the line when you're transferring back to your home world. But hopping between worlds is probably something they would want to discourage so more players can play on the server they are designated for. That's why only a certain amount of characters are limited per world during character creation. If you need to visit another world unfortunately you'll have to wait until after 11pm and before 3pm EST.