As Machcio said, the great soul ticket event has returned. Those of you who are stuck on 6-2, farm the event for the next two weeks, even to the extent of basically ignoring the rest of the game, apart from the daily world bosses to load up on rations. Get your 100 or whatever soul tickets, get another Takeda Shingen of Kai or Naoe Kagetsuna or whatever, get a few more UR generals worth spending those Universal EVO cards you got from the Land of Fire event, and then once you get them leveled to 55, you won't be stuck on 6-2 anymore. Then you can be stuck on 6-3.

As for the Takeda Shingen tickets, save them for the next platinum priest event, as that can be good for dozens of platinum tickets.