Levelling secondary class with no more quests?

[Niwashi]

Hell i leveld all classes (except ninja obviously) to 50 with FATEs before roulettes were introduced

Well, before Roulette was introduced, FATEs were the fastest way to level (and way overused as a result). But then with the addition of Roulette and along with it some major boosts to in-dungeon mob-kill XP, dungeons surpassed FATEs for leveling speed.

So, even for DPS jobs, you want to run dungeons as much as possible if your aim is leveling up. The fastest leveling is probably to stay either in a dungeon or queued for one continuously, while doing FATEs and/or leves whenever you're waiting in queue. (If you choose the region to FATE in based on where most of your hunting log targets are, you can probably knock those out along the way.)