The Mental Health Teacher on YouTube has 5 great Mindfulness videos for kids. Mindfulness is a great way to help kids regulate their emotions and maintain focus.
Confident Parents - Confident Kids has great advice on how to address COVID - 19 with you children as well as a Kid Resource page with games for kids to play.
Conscious Discipline provides video and printables that help families navigate through the changes presented by COVID-19. It requires a sign up but the resources are free once you sign up: