A good approach is to use a children's cartoon movie about Bitcoin.
When cartoons become a lesson for you and it's not just an ordinary cartoon of course it will be a pretty good cartoon.
\Moreover, information about Bitcoin will be obtained in the cartoon show.
But we also have to accompany them when watching this cartoon, while explaining what the purpose and purpose of the cartoon is.
There will definitely be questions from children when they start watching the cotton.
Then be happy enough to answer them with answers specifically for children.
Don't be too burdensome, if they like it to continue but if they are getting bored then intersperse it with other cartoons.
I also found a channel that discusses crypto and Bitcoin but the host is a child and he explains in his own language with examples that are easy to understand.
https://www.youtube.com/@CryptoCoinKid1There are many methods or videos that can be used to introduce Bitcoin early on and of course in a way that is suitable for children.