What do you do for work? Would you still be doing that for work if there was no extrinsic (ie. financial) reward? How well do you do your work, and how much better could you do your work? When was the last time you assessed your efficiency and effectiveness at the work you do?
To work is to function or operate according to design or plan. Assuming you know what you were designed for and you have a plan to operate in alignment with that design, could your work be your calling card?
Are you so proficient at your work that people who are exposed to your craft can recall days, weeks and years later an interaction with you?
Could your work be your calling card?