End Game Malaise, what to do?

[OverKnight]

I'm about 100 turns into a Milan campaign H/VH and I've officially won. The Mongols are bouncing around the Baghdad, Mosul and Edessa axis sacking and killing the occasional Turk but not coming toward my territories in the Levant.

A part of me wants to see the Panzer-phants and the New World, but right now the game is a drag. It's devolved into agent management and stomping on the smaller powers left in Europe. My Empire is large and unwieldy.

Any tips on curing the late game blues and making the end game interesting? Or should I just start over and fight a defensive campaign on a smaller scale?