It seems your plans were interrupted when Mao DoWed you and you had to organize a defence in emergency. We can also see
that Roman stack coming your way. Surely, Caesar is smelling blood !

Things would appear a little problematic at this point, if it weren't for a simple fact, which I guess you haven't come to realize, yet : The war is already won ;
you have won the war
So, congrats on a successful defence ! Doing what needs to be done, etc. Even though I'm sure there has been a couple of stressful turns, the kill/loss ratio speaks volumes...
So, you can buy peace with Mao for some gold (don't gift him the city he asks

) and resume your seemingly peaceful plans
You have a lock on Liberalism. I guess a Cuirassiers stampede is the easiest way to complete the map. Don't worry about horses, you'll get a trade at some point.
Playing towards that, you're extremely well set up for a Golden Age, switching into Caste and Pacifism. Given that you already have Education, perhaps consider raising Merchants for upgrades ?
I suppose you've neglected your civics a little bit ? The Confucianist Apostolic Palace is ideal for you.
Before the Caste switch, I would probably spend a few turns in Organized Religion, so as to complete the spread
and spam those sweet, sweet Confu buildings everwhere.
So,
just tech up

Mind your diplo and trade opportunities.
There's no need to war on the AIs terms. You can go to war on your own terms and sac pop to produce the units you really want. There's no need to whip Catapults when you're so well set up to entre the Renaissance.
For now, you have all the defensive force you need. You can abandon all catapults that are in queues. Gather your 4th Elephant to your city, which is an excellent defensive spot. And, if you're really worried about Caesar (I wouldn't be, at this point), perhaps produce a couple more Elephants.
My assessment is that Missionaries are a better investment than Elephants, however