My next quest is level 49, what do I do?

Short Answer

If you are stuck with your level you can do the following:

• Duty Roulette: Leveling (only once a day)
• Unlock Dzameal Darkhold Side-dungeon - https://ffxiv.gamerescape.com/wiki/Fort_of_Fear
• Unlock Aurum Vale side-dungeon - https://ffxiv.gamerescape.com/wiki/Going_for_Gold