Final answer:
After the success of the windmill, William wanted to build more windmills and harness wind power for different purposes.
Step-by-step explanation:
After the success of the windmill, William wanted to build more windmills.
Wind power was already being used in other areas, such as driving force for sailing ships and in water mills.
William saw the potential of wind power and wanted to harness it for various purposes, such as grinding grain or pumping water.