When a map (such as Fluorite Plains) is busy, it's best to keep on trying until you get through or wait until there are less people online. You can see this by looking at how many users are online at the top of the screen on the forums.
It's odd that you cannot get through to Ficho though. It's usually quite vacant. Once I was stuck between the portal from Bonfire to Ficho, and I had to wait a couple of days before it would allow me to get through. Sometimes it just does this.