There are dozens of territories with no produced goods; new resources could be added. Hundreds contain fish, grains, fruits, spices, timber, and tropical hardwood, all fairly generic and could be traded to improve the balance.
This could include: lamb, goat meat, horse meat, beef, chicken, eggs, duck, leather, milk, eucalyptus, mahogany, ipe, brazilwood, ebony, oak, salmon, tuna, cod, tilapia, sardines, whales, rays, beans, kerosene, clean water, shoes, corn, olive oil, cinnamon, pepper, oranges, pears, mangoes, papaya, pineapples, peaches, apples, strawberries, grapes, melons, coconuts, soybeans, wheat, peas, vodka, tequila, rum, niobium, copper, nickel, zinc, lithium, graphite, graphene, plutonium, rubber, mechanical parts, and electronic components... For example!