You can consider these two aspects when looking for a job.

1. I like technical jobs related to mathematics (if I can provide training, I'd better strengthen my knowledge reserve in this area), such as financial and computer-related jobs. Or some construction projects, materials and budget work.

2. Graduated from marketing major+introverted. You can choose market research, procurement or channel sales (this can reduce direct contact with people). If you want to engage in sales, you need to break through your personality bit by bit.