The Christian life isn't an occupation of "What work should I do" or "what position should I hold" or "what ministry should I have for the rest of my life?" The Christian life is relating to Jesus everyday and letting Him lead you everyday. Whether they realize it or not some people hold a mindset of "Now that I have my calling I can stop walking with God day by day and just do my assignment. What I do is important and who I do it for is important but it is not important that I live day to day WITH God." 99% of the time the scripture talks of "God's calling" it refers to God calling someone to be saved not God calling someone to do a specific long-term work.
Instead of doing something for God why not be someone with God?