You can do it.
1; Train children's writing ability, starting from 1, horizontal number, 1, 1.
2; Don't be too hasty, so children will cause stress.
3; You can buy two hard-pen calligraphy, and it is not too difficult to exercise your children slowly.
4; Children can be required to write half a word carefully every day [only half a word], provided that they must write carefully one by one, so that children will not feel too tired. Practicing half a word every day will help children write better. This is what our teacher taught us, which is very useful.
I hope my answer can help you.
May your child's handwriting become more and more beautiful.