Remember to do the challenge log and the low level roulette at the end of the day. The exp you receive from these is proportional to your current level, so don't waste it. Remember that now the guildhests are tied to your job, so if you switch to a different job, you'll receive a completion bonus from these like you did for the first time. Post level 40, if you have lowbies in your FC or if you prefer to use PF, you can always do Dzemael Darkhold first room speedruns. You can also get leech exp from levequests. We did this with my friends. When they got to level 45, we took them to Mor Dhona and he was activating the levequests as we were completing them in less than a minute. The exp you receive from a levelquest from your level, is almost the same exp you receive from a FATE of your level with the 50% bonus.