1) Don't build roads to cities until their pop is equal to or greater than their distance to the capital. 2) Sell excess luxuries to AIs for 7 GPT each. 3) Research Sailing/Engineering for a 3rd trade route. I'm seriously honor in my latest Deity game with 4 Swords, 3 Comp Bows, 2 Battering Rams, 4 Horse Archers, and 2 Horsemen, and I have +23 GPT. No Tradition at all. Why do you have 6 cities with Tradition? Should've gone Liberty. It also helps immensely to build a Caravansary in your capital and have it send all your trade routes to other capitals.