You can think of 1-49 is like your tutorial. Once you get to 50 that's when the game starts. Everything that you learned about your class in the earlier dungeons is put to the test in the end game. Yoshi-P said himself that this is how he wanted to structure this game. Do some endgame content, and I mean real endgame, not relic quest trials and LP dungeons. If you're still not enjoying it the game probably isn't for you.