My play towards the end was very clunky. Citizen placement in Vienna and Graz badly needs optimizing, I could cure a lot of unhappiness by finally building a Lighthouse in Vienna, I just plain forgot. Similarly, I uh... never converted Karakorum. My build order has been a bit shonky, and Vienna should have been working more growth tiles, I got greedy. Basically, the moment I got Karakorum I was sort of just skipping through turns a bit.