Preheat the oven to 375 degrees F (190 degrees C). Grease a 9x13-inch baking dish.

Beat 1 1/2 cups sugar and 1/2 cup softened butter together in a large bowl using an electric mixer until creamy and smooth. Beat in eggs, one at a time, beating well after each addition. Whisk 4 cups flour, baking powder, and salt together in a separate bowl until well combined; stir into egg mixture, alternating with milk, until just combined. Fold in blueberries until evenly distributed. Pour batter into the prepared baking dish.

Combine 1 1/3 cups sugar, 1 cup flour, and cinnamon in a medium bowl; cut in 2/3 cup cold butter using a pastry blender or 2 knives until crumbly. Sprinkle topping evenly over batter.

Bake in the preheated oven until a toothpick inserted into center comes out clean, 40 to 45 minutes. Cool on a wire rack.