The best way to better yourself financially is highly individualistic. It depends on your wealth, skills, education, abilities, location, opportunities, etc. In any case, I don't really see how a blanket abolishment of income taxes is going to magically incentivize the "right" things and deincentivize the "wrong" things.
Generally speaking, you want to incentivize people to try to better themselves financially by pursuing highly productive and legal activity. If the best way to better yourself financially is rent-seeking, becoming a government bureaucrat, corruption, or participating in the gray/black market, that is what you will get.