Here are some bookmarks I designed to encourage kids to read physical books. I procured most of the images from royalty/copyright-free Pixabay.
Basically you just give your kid the corresponding bookmark as your kid completes the target number of books. I’ve included a tracking sheet as well to keep track of their reading list. The idea is not to rush though, focus on quality over quantity.
There’s a couple based on the moon and planets as well.
Suggest that you print on thick card stock or 180-250gsm paper (most home printers can handle this).
I’m giving them away for free. There’s no catch, except of course please don’t resell them or take credit for them.
Just drop me an email at firstname.lastname@example.org and I’ll send you the high-res files.