What is the purpose?
There are mutterings in the populace about things felt but not experienced. Things that are not the synthetic bread and circus they see on their screens that they experience but do not feel. They talk of...spirit.
Witch, you must use your knowledge of the arcane to wrest souls from their electronic doom. Souls. Soul is now a dirty word in a world of tools made by man. Tools that let us conquer our surroundings and lash out at the stars.
Take your followers and give birth to legions. Convert, conquer, and continue the cycle through the 12 sprawling urban complexes that comprise humanity. Leverage your growing powers in the magical against those of man.
Convert potential followers or conquer as necessary by subduing the other shaman. Start with your small number of followers and bring your one true path to all.