Come to Coeurl!
We're a small-mid size server!
Hunts are more organized. People are friendlier and your reputation carries the weight of mountains.
I'm in a fantastic and supportive Linkshell for newer players that regularly runs difficult "older" content with the sole purpose of helping players get to experience the game without massive queues and terrible groups (we don't carry, though, so you still need to work!).
Alternatively, you could go to Balmung or Hyperion. Those are super packed servers with loads of people on 24/7.
Coeurl has a sizable EU population for off hours and a medium-high sized active population during peak US hours.
Check us out!