キャラクター

I'm going to ASSume you want to level up the easiest first, conj.
Unlock: Guild heists RUN one roulette then complete 9 more for a great bonus. Also give comms to satisfy your Challenge log.
Challenge log. DO EVERYTHING you can save the last run for the job you want (eg: White mage)
Roulettes EVERY day. Once you ding in at 50 do your Boring and long ass MSQ rout EVERYDAY. Unlock Labyrinth of the Ancients at Mor Dhona and do all three of the 24 person"raid". THEN do Allied Roult EVERYDAY.

Eat food for 3 percent bonus
Ask your FC order of bahamut to initiate FC buff(s)
IF you have any pre-order rings/earrings ect equip them whenever you run something of that level.
Armory bonus: When you have a job LEVELS ahead of the rest you will receive a slight bonus
Always log out near a crystal: That will provide you a slight bonus
or read this please:

https://na.finalfantasyxiv.com/lodestone/character/14206011/blog/3995928/