If your true nature is spiritual, that is, if you identify more with your soul than with your body or your mind, you will know that your purpose in life is also spiritual.
You have come to this world to learn, to evolve, to improve and to help others and the world around us. For this, you will use, of course, physical means, because you are in a physical world and you have a physical body. But your nature and your purpose remain spiritual.