Comment by scarecrw

I work teaching CS to a variety of age levels (admittedly mostly teenagers and older), and one thing I would recommend is broadening your consideration about what CS fundamentals might include. Picking up language syntax or new tools is easy enough at whatever age, but problem solving and planning skills are very tough to rebuild as they grow into adolescence.

One of my personal favorite resources is CS Unplugged. [1] It sidesteps any particular language or toolset in favor of pen-and-paper interaction.

[1] https://www.csunplugged.org/