As you learn more about yourself, your Soul mission changes slightly, adding and subtracting small bits to forge something that is unique to you. Your Soul mission is not defined by the job you have, instead it is the role you play in the theatre of life. That role can morph and change, but the central motivation for that role will remain the same.
Think about the things in life that motivate you; compassion, transformation, positive change, education, spiritual growth, etc. Find the number one motivator in your life, the top activity or topic that makes you excited when you put your time and energy into it. It can be anything! Whatever that number one motivator is, it reveals a very important piece to your Soul mission.