I would suggest considering the resources available in each of the tribes' environments and how they might use them in their daily lives. For example, the west tribe, being nomadic and living in a forested area, could potentially have access to a variety of plants and animals for food and materials. They could potentially use horses for transportation, and create clothing and shelter using natural materials like hides and furs.
The north tribe, living in a cooler, evergreen forest, could have access to similar resources as the west tribe, but may also have access to a wider variety of trees for building and crafting. They could potentially use sleds or snowshoes for transportation, and create warm clothing using the furs of animals like wolves or bears.
The east tribe, living on the beach, could have access to a variety of seafood and seaweed for food, as well as shells and other materials from the ocean for crafting. They could potentially use boats for transportation, and create clothing and shelter using materials like bamboo or palm leaves.
The south tribe, having access to a variety of earth and metals, could potentially have access to a wide range of resources for crafting and building. They could use carts or wagons for transportation, and create tools and weapons using metals like copper or iron. They probably have the most need for infrastructure, especially as it relates to extracting and moving heavier resources.
Overall, it's important to consider the unique characteristics and resources of each tribe's environment when developing their culture and way of life because that's what makes it most realistic, but also makes it easier to research what resources would be there based on what real-life places actually have, too. I hope this helps even though this thread is a little old, and good luck with your writing!