If you're tired of levelling through potd then run dungeons instead. And roulettes. Especially the alliance roulette, once you get it, gives a lot of xp for the run. I prefer running dungeons to level over potd because there's more variety, plus you'll actually be running your class/job in its proper role in the group and get experience playing it as that. If you're playing a tank you'll have almost no queue times for dungeons, plus you'll often get more bonus xp in roulettes for being Adventurer in Need.
Levelling from 1, go kill some random bugs or do some leves until you're 10 then jump into guildhests/more leves until you're 15 then you're ready to go in dungeons. It really goes quickly, especially if you get your hands on the leveling xp bonus ring from the novice hall (and if you have the ala mhigan earrings even more better!). There's an fc xp buff as well, and if you have a squad levelled enough you can send them off for the squad xp buff scroll (which will overwrite the fc buff but it's better than that anyway, although it only lasts 2 hours).
