In those ways that open to you day by day. It isn't always the individual that plans to accomplish some great deed that does the most. It is the one who meets the opportunities and privileges which are accorded it day by day. As such opportunities are used, there are better ways opened. For what we use in the way of helpfulness to others, increases in itself. Begin with what you are!
On being asked: Please give a detailed account as to how I can best serve humanity
Many Mansions Chapter 20 - A Philosophy of Vocational Choice