Do you think insurance and property agents earn a lot of money? Together with taxi driving, these kind of professions have low entry barriers. You don't need degrees or many years of education to enter these trades. Being in this kind of trades is like running your own business. How much you earn is totally dependent on your hard work. Sometimes no business means no income!

So instead changing job to be an agent or taxi driver, you should do it part time in addition to your current job. In this way you can boost your income, and yet not worry about having no business.