Children, like adults, have had their worlds turned upside down rather instantaneously. Kids have lost all their normal routines and direct contact with their friends and teachers, not to mention social gatherings of import (What do you mean my birthday party is cancelled?!)
It is normal for your child to be struggling right now. It is normal for your child to be more anxious, clingy, irritable, and defiant. It is normal for your child to regress. The goal right now is not necessarily for your family to thrive, learn, and grow in spades. The goal is to survive this very stressful time in one piece.