George Orwell, by writing a dystopian Juvenalian satire in 1984, does not give any modifications or ways to improve government. There's no implicit message or hope or beauty or freedom in this book.
This kind of satire is attack-only. His words are meant to destroy 1984s totalitarian government, not to tweak it. You can't have Big Brother be reformed politically or socially. He must be obliterated. There's no conciliation, no qualification, no room for maneuvering.
Ironically, Big Brother wins against the individual. That's Orwell's thesis. There is only torture in this type of government. It's not a subtle message. There's no hope. Period.
History, I think, has proved Orwell right. Communism (and fascism) was a god that failed. It took 50 more years though to topple, so many more individuals were tortured along the way.
In my opinion, Orwell wants to change pretty much everything about the society in this book. I think his biggest concern is with the social system more so than the political system. He does not appear to be concerned with trying to push electoral democracy. Instead, he seems to want simple social and personal freedoms.
What Orwell seems to want to change in this book is people's ability to be normal people with their own memories, their own feelings, and real relationships with other people. Orwell focuses on these things and has Winston long for these things more than for political rights.