~公司卡片~title應該寫咩?

If the company is a firm, your booss could be spelled out as Proprietor in a Sole Proprietorship; Partner or Senior Partner in a Partnership Firm.
If this is a limied company, then stated it as Chairman, Managing Director, Director, CEO ..

既然自己做老闆，title當然是 "任您寫" 的了！