Hey, idk anything specific about UCB, but your GPA is not so low that you should sell yourself short on ever getting into competitive MPH programs in the states. Biochem and Micro are difficult majors, especially at a respectable place like UW. And it seems like you have some solid related experience and could get good letters of rec from them. If you take a year or more at your current job, study to get a good quant GRE score, and write a strong SOP, I think you could get into most programs. I think your instinct to turn down University of Copenhagen's offer is the right call.