You will spawn in a forest near a small village at coordinates -450, -400. It is located under the hill, so it is very well hidden. There are only a few buildings in the village.
After looting the village, travel to coordinates -700, 200, where you will find a pillager post overseeing three biomes: swampland, wooded hills, and forest. Inside the chest at the top of the tower, you will find a crossbow.