You're a Water Sign, which means you're very connected to your emotional nature. Cancer likes to commune with the world around them, learn a great deal, and perhaps teach what they've found to others.
Most of all, you need your work to have deeper meaning than just a paycheck. Some of the common fields for Cancer natives include teaching, nursing, healing, and food services.
You want, more than anything else, to make others happy with your labor. If it's humanitarian or charity-based, it's that much better. You find great joy in furthering your values.