Dungeons now give very good exp. For instance in Stone Vigil at lvl sync I was getting 1800 exp per kill. When waiting in duty finder do leves or fates. I personally save my leves for crafting as I notice that it is becoming more expensive the higher I get. Best advice, find a good Free Company that has EXP bonus up when your lvling, eat food 3% extra exp adds up over time, don't forget to rest, Have Fun!