Give me some tips on leveling please to make sure I'm not missing anything obvious

Been ripping through this game, but every 50 hours or so I get the itch to try a new job and end up flying through that one. Turns out I love them all.

Currently trying to get all my jobs caught up to quest level (68) and boy is it a grind. Right now it's all DPS jobs in various levels of 50-60-- all my tanks and half my healers are caught up.

Aside from doing all my daily roulettes and then queuing for highest level dungeons, is there any obvious fountain of experience I'm missing? Some of these mid-50 dungeons get a bit boring. Great Gubal Library and Sirensong Sea have been bailing me out.