Married to a Taiwanese, what is my status?

I am a NZ citizen married to a Taiwanese. We have been married 2 years and have a son who was born in Taiwan. I am here on an ARC, but this restricts me to one legal job and my reason for staying in Taiwan is just for work. I don’t like my resident status and being able to work being dependant on my employer. From what I understand I need to be married for 5 years before I can apply for an open work permit. This permit allows you to work any number of legal jobs. Please correct me if I am wrong. I also would like to know if I have any other options.