Should Xinyu be isolated from Ganzhou and Du Yu?

Don't. According to the requirements of epidemic prevention work in Ganzhou, as of mid-April 2022, Ganzhou and Xinyu have been verified as low-risk areas. According to the epidemic prevention policies of the two places, you only need to hold a 48-hour nucleic acid negative certificate to return to Xinyu from Ganzhou, and you don't need isolation. You can stay in the hotel normally after you come back.