AnnaFreud.org focuses on supporting young people during times of crisis.
The self-care resource has many simple self-care activities which can be done at home. Written by young people to help other young people who are feeling low or anxious. The strategies should also be useful to adults.
Place2Be is also a very good resource:
MIND and YoungMIND.
Mindmoose is offering all schools free access to its resources if you contact firstname.lastname@example.org