I'm a little amused that your reason for leaving was that it was too easy to level, and now you're worried that you won't catch up. The answer is that it's still easy to level. Maybe even more so than before, since dungeons give more XP now; you can do low level and guildhest roulette once a day for a ton of XP; they added a challenge log that gives you XP; and the Fates now because of ATMA are pretty populated and therefore a decent way to get XP. Maybe I misunderstood what you meant but if not, getting to 50 would be fairly quick for a healer.