When you say "My MSQ is complete" as a level 50 player [since you didn't quantify your current level, so I have to believe what's shown via the forums] do you mean you finished the 2.0 storyline, or all the way through the 2.5x storyline? Currently (pre 5.3 release next month), there are over 100 quests and trials/dungeon instances, including side-quests and side instances, that should put you anywhere from level 52 to 54 by the time you get to Heavensward content.