How to Cap UK as India

I was trying to capitulate UK as East India Company -because I do not wanna pay taxes you know- problem is despite I invaded them from multiple ports -I took Hull and around with 35 units, then took London and its around with another 25 units naval invasion-

But still UK stopped me breathless pushing so I couldn't expand further and even I gave Germany to control of territories I took they didn't send me any fucking help.

My units are 8/1 infantry with anti air, I couldn't have time to built an air force because you know this path basis on civs and kneelling remnants of Raj requires so so much civs and since I am suck at navy I had to rush this focus so I reach the dutch east indies wargoal after it for stealing dutch navy.

So do you have any advices or should I roll at ahistorical until UK do something stupid and dies?