My experience as another new player who beat ARR MSQ a while ago was much the same by that point. I was routinely 10 levels ahead of the MSQ for much of the game, but once I dropped doing side quests it evened out towards the end of the game and I was exactly level 50 for the final mission.

Sadly MSQ remains super easy at least until the end of ARR (can't comment beyond that yet), but once you complete ARR you get to unlock some more challenging content. The content between ARR and Heavensward unlocks hard and extreme versions of previous Primal fights, plus introduces few new ones, and those have been geuinely challenging to get through. You also unlock the Crystal Tower raids which have some interesting and cool boss fights. The number of players involved means your group is unlikely to fail, but at individual level it's easy to get killed in them if you're not paying attention.

I've found myself enjoying the game a lot more after beating ARR and I haven't even gotten to the Heavensward portion yet, which is where everyone always says things get to be good.