Use speed 220 on a horizontal farm measuring 1 by 5 plots for pumpkins. 

Make sure that there is water at the beginning of the farm, and then there are four blocks of land on which to place pumpkins. Repeat this with the plates above the water. At the end of each line, place a block in the water on which the next line will continue. On the first pumpkin in each row, place a block with a trap that will look at you. Repeat this for each line to the end. 

Set the command «/setspawn» at the beginning of the farm with the exact direction «yaw 90/0» and the slope «pitch 28». Make sure that your tool is in the first slot of the Quick access toolbar. Then run the macro. 

You will start the crop rotation from the left (left) with the «A» key, then continue forward with the «W» key and then continue to the right with the «D» key.