Honestly, there's really no such thing as "playing on the right server" from a persons mind set. I have a few toons on Midgardsormr, Cactuar, Gilgamesh among some other servers. If you're specifically looking for endgame stuff to hop back into after grinding out tomes and gear, there are select servers tailored for endgame (although a lot of new people on them as well). RP servers where most of the current players will be for Role Playing, among non RP players. New players or returning players can come and go as they please. It also depends on your current time zone, as each data center is specific to north america, EU, etc too and whether people will be up at the time you are (prime) or not. If you're in north america, the data center recommended would be any of the current listed in Aether Data Center. If you're ever on Midgardsormr, our FC is always actively looking for members, but welcoming and helping members too! Don't be a stranger! If you have any other questions, let us know here on the forums! Hopefully you find something or an FC to your liking! Happy hunting!