Is the Chicago editing certification worth it?

Hi everyone! I recently graduated with a degree in English and desperately want to break into freelance editing. I know that getting an editing certificate can really help further my education and boost my portfolio. What program is best for developmental editing, specifically for YA or NA fiction? I've heard good things about University of Chicago but mixed reviews about how helpful it is for fiction and developmental editing (especially for the cost). Any advice would be much appreciated!