The spores are the main concern. Bleach releases them into the air. Did you wear a respirator, close off the area from the rest of the house? Open a window? Do you have small children or animals?
Hire a pro. Mold is dangerous. Hydrogen peroxide will kill it but also releases spores in the air. Pros will put up plastic and direct the air out of your house so there is no spores in the air. Mold can make you sick or kill you.
That drywall looks wet. I would remove all wet or moldy drywall and insulation. Run a fan on area to remove remaining moisture. Mold and mildew are not to be taken lightly. As some mold is deadly