If your character is elonian (you created them from nightfall) they will have to progress the way the chart says...if they are from a different chapter (prophecies or factions) the chart is a bit different.
UNLESS you got a run and then the chart may be messed up, but for the most part...check your map to see which missions you have completed (have the crossed swords), if there are any blinking at you (this would be the next mission you need to do), if there are no blinkers...then you need to look at the quest list on the link and see which quests you have done--visit the npc who gives those quests.
however, you might have to do some leveling of sunspear points if you are 'stuck' with nothing blinking and no quests (what is your sunspear level???).
but first I would look at your map and see which missions you did so you can figure out where to go from there.
where is the 'all you can eat' cookie bar?