Ayo
the epic life quest chain starts at like level 18(?) or so, maybe earlier, and the epic water saga quest chain needs you to complete Abysall Precipice dungeon at level 50 in either normal or expert mode.
aside from the epic quest chains, I recommend that you try the chronicles at level 50, the are a LOT of fun and progress the storyline quite nicely, the solo chronicle is quite a good example of what to expect.