If you don't have someone that can tank or heal who we lovingly refer to as "queue bitch" (and is usually me), queueing for dungeons and roulettes while doing FATEs is the best way to handle it. I usually recommend people to queue for the 2 highest dungeons they can run after they use their roulette bonus as you still get good XP from a dungeon that is a little under your level and queueing for 2 dungeons at once tends to give you a faster queue.