How do I use the magic wand to add color to a vectorize image that was image traced and grayscaled?

Hi, I am looking for some solutions to an issue I am currently seeking. Is there a way to use the magic wand to colorize certain parts of a grayscaled vectorized image that was image traced? I saw other solutions online however I would like to learn the process of using the magic brush for grayscaled vectorized images. Thx for the assists in advance.