Welcome to the forums!
Took a quick look at your save. You are doing alot of things right and are at a winning position. Your city placement is fine. As are your choice of wonders.
However, something I noticed in no particular order:
- Why do you hate cottages?!

You have some nice riverside grassland cities that would love to be cottaged up.
- You have alot of extra trade resources you can exchange for goods with the AI or even gold/turn. On top of that you will get +2 diplo for resource suply after some time.
- You made an arrogant demand on Lizzy, why?
- Don't build research (Bombay is atm), wealth is better.
- Don't build wealth at this moment in the game. Military is better.
- Your army is very weak considering you are at war (4-5 knights). Knights sucks for war and comes at a bad time for war. Gunpowder units own!
- As does siege! Only 1 Treb?
- You are building a coloseum in Agra. A forge gives more happines and a production bonus!
- Delhi: No cottages?? No uni? Usuallly you want a cottaged capital and then run Bureau for crazy science. Add Oxford for crazy combo. You also want an academy in that city...
- This brings me to civics... Vasalage is good if you have a huge army that needs extra xp or your crazy neighboor favours that civic. You have neither. Bureau is almost always superior until you want to start drafting an army with Nationhood. You should be runnnig nathionhood once you get rifling.
There is no reason for you to stay in Conf. Adopt Free Religion and make some friends. Yeah Toku will be pissed, but just draft an army and your fine. If you want to run a religion atleast spread it to all your cities. Your 3 most important cities lack your state religion = no Organised Religion bonuses here!
- You have military tradition qeued next. You are too late for cavalry wars. Go cannons+draft rifles instead.