Some helpful website which promote creativity, high level thinking and challenge:
https://scratch.mit.edu/
https://www.tinkercad.com/
https://kidsenvirohealth.nlm.nih.gov/
https://www.jpl.nasa.gov/edu/teach/
https://www.dcidaho.org/dciathome/
https://wideopenschool.org/
https://code.org/