Moving your city into Alliance territory gives you a massive gathering speed bonus.
If you want to see your gold stack rise quickly, you have to be active in the world map.
Every time an ally buys a pack or defeats a world boss, you get a chest. These chests often contain gold and speed-ups [3]. Phase 4: Event Stacking
Participate in capturing shrines and altars. Many of these provide a kingdom-wide (or alliance-wide) buff to gold production.