I think that to be good at any sort of marketing, you can't be empathic. The moment you start putting yourself into someone else's shoes, and asking yourself if this is something right an just to do to the other person is the moment you become terrible at marketing. What I'm saying is that it takes a certain amount of callousness, a kind of willingness to take advantage of people, in order to do sales well enough to make money at it. You have to be willing to pay people less than what things may be worth, and sell things for more than they are worth or to people who cannot afford them or who don't need them or who even don't really want them.
Some Christians can justify this, and do a good job at sales. They believe that an object's worth is whatever you can get for it. So for example, it really was worth $10 when you bought it, and really was worth $100 when you sold it. The fact that you made such a good profit shows that God is blessing your business.
I for one, could never do it. I couldn't sell water to a man dying of thirst in the desert. I'd tell myself that he's dying of thirst and that I'm taking advantage his needy state, making a profit off of his misery. I find jobs that are of service to others, an believe me those jobs never pay much. For example, I'm presently interning as an Alcohol and Drug Counselor. I'm kind of the opposite of a sales person.
But that doesn't mean I don't see the value in someone who can make a deal. We each have our own set of gifts. Your gifts are simply different than mine. IOW, I definitely am not going to give you advice in this. You have to work it out between you an God. Search your own conscience. You will find the answer there.
After all, charities like the ones I work with could never survive if there weren't successful people who donated money!
May I make a suggestion? Take one of the many Myers Briggs Type Indicator (MBTI) tests that are online, and see what your gifts are. The MBTI is the most widely used personality test in the world. If you're an INFJ like me, careers where you use your empathy and intuition (like teaching, counseling, etc.) are where you'll find meaning. If you are an ESTP you'll probably be highly successful in marketing. If you are an ESTJ you will probably be comfortable in some form of office work, accounting, or management. If you are an INTP you will likely be happy in Science.
take an abbreviated 70 question test for free
Free, Scientific Personality Test of Briggs Myers' 16 Types - The TypeFinder® Research Edition
career suggestions by type
https://www.iccb.org/iccb/wp-conten..._resource_file/Suggested_Careers_for_MBTI.pdf