A plug for "Math from Three to Seven: The Story of a Mathematical Circle for Preschoolers" seems warranted here. It has great ideas for fun things to do with kids as well.
https://www.goodreads.com/en/book/show/12689040-math-from-th...
https://www.goodreads.com/en/book/show/12689040-math-from-th...
Edit: Just looked through your website. Love the math and the satire. Keep it up!