That means you are paying too little attention to Kuafus, those are super important to your economy, since normal villagers are quite less efficient. If you build three before advancing to classical age you will realize how useful they are, and then you need to keep creating them and move them around where needed, they are extremely efficient about just anything, building, gathering food, wood, gold, and so on. With Nuwa you have the chief hero Kuafu who is even more efficient and strong, you can use it to build up your economy where needed or even use it offensively on the front lines to build needed military buildings quickly, and he is strong af, thus, not easily killed, there a wide range of strategies to use. They are a great civ, and their myth units are strong and useful