I personally started at this age.
Therefore, from primary school to now, it is much more prominent than other children of the same age in this respect.
You can let your child go to the Children's Palace to learn the skills of holding a pen for a while, and then buy a copybook for him to copy when he grows up.
Children with a foundation will improve their handwriting after many exercises when they grow up (= = I often have great changes in style compared with before)
I hope my suggestion will help you ~