The number one threat to Roman Hegemony? BEARS!
This is officially the best thread in this forum.
Anyway, China is looking like it might actually be a threat this game!
I'd advise keeping Qin pleased while invading Africa and the Middle East. Preferably the middle east first though, as you want to keep Cyrus from mass vassaling. He already has Mansa Musa.
The other (warminded) option would be to take out Cyrus right now, maybe getting Sal first though since he's in between you two. That would give you a non vassal border with the China Bloc and would also prevent Cyrus from becoming a powerhouse.