If you still have a copy of A Theory of Justice, definitely pick it back up. If you'd like to work through his later-life work, then you'll want to grab Politic

If you still have a copy of A Theory of Justice, definitely pick it back up. If you'd like to work through his later-life work, then you'll want to grab Political Liberalism and Justice as Fairness: A Restatement, in which he revisits his original ideas, and brings together a full account of justice as fairness as he later understood it. Definitely recommend digging back into him.