You need to determine the field of your gift and enter into the realm of experts for that calling

What you think about most often is your calling

What you do intensely that you forget meal is your calling

Find your gift, the thing you were created for, the thing that inspires you and the thing you are fond of doing, and the thing you are doing better than others

The things you love so much or hates so much can be your calling

What inspires you and you want to be more successful at is your calling