Hi guys, I am currently at level 13, is there a guide or advice that you can share to level up in a bit more effective manner?
Do the ingredients missions for the harps and genies when they open at rank 15 till then online dungeons and pixie farm
Daily mission, and ingredient mission will help you a lot 
and try to get 90% of experience bar before use silver key to unlock ingredients quests
Get to within ~100-300 exp of your next level and do the ingredient mission that gives you the most exp. When you get to level 15, try and do the Golden Tower in the Mouth missions for the most ticket-efficient way of farming exp. I went from 14 to 20 in one day from this method.