You're describing a very different experience than mine. I hate repetitious grinding so i don't do it. I mix up what I'm doing so i can learn the job I'm working on. I always do some combination of Hunt logs, Each dungeon along the way 1 or 2 times, a handful of leve quests every few levels, roulettes, Guildhest first time bonuses for each class, and fates as i come across them out in the world doing other stuff. All of that said and It never takes more than a week to get a job to 60 and I never feel like it was stale.

Perhaps broaden your view a bit and when you start getting bored go do something else.