You had to be smarter about what side quests you pick up :/
While SE will be adding in side quests later there was no indication that quests were repeatable. Just the main story line and dungeons
could have held you through and then maybe a quest or 2 here and there. I typically only do side quests when I'm really in a bind, which has happened only a few times while trying to lvl up my Arcanist from 28 to 30.

But yup until the side quests are updated there is your hunting log, levequests (you can do the leves as you do your hunting log.), FATEs and guildleves/dungeons. For FATEs you could even try looking for a FATE grinding party (I did it the other day for a couple hours. It was kinda fun even if it was a bit chaotic bouncing from FATE to FATE lol)