To reach a population of 150 Peasants, you need to build more houses and ensure their basic needs are met. Each Peasant house can accommodate a certain number of inhabitants, so continue constructing them until your population counter (top left of the UI) shows 150 or more. Crucially, Peasants require two goods to be happy and upgrade: Fish and Cider. You should already have Fisherman's Huts producing Fish. For Cider, you'll need to build a Cider Farm. Place the Cider Farm on an island with Apple fertility (which should be present on your starting island). Once the Cider Farm is operational, ensure it's connected by roads to your Warehouse. Finally, Peasants also require access to a Chapel. Build a Chapel within the influence radius of your residential areas. As long as these needs are met, your population will grow steadily, and your tax income will increase.
