You have made him afraid of writing and reading, and it is not appropriate to force him to study again. I suggest that you can teach him to draw, and praise him hard no matter how bad he draws. In fact, painting is learning to write. When he is interested in painting, you can guide him to name his paintings, but don't force him to write them all to see if he likes them. For example, it says that the duckling eats grass and draws a circle when the grass can't write, and then jokes that it is eaten by the duckling. Little ducks eat cakes? When everyone is happy, they teach the word "grass" happily. Teach children to be imaginative. Don't touch him because of his study. Now he is only four years old, and he is still saving the country on the curve. It is very important to say something when he is happy, to play when he is not interested, and to keep his happy mood during his study. Don't let him think of learning, and connect learning with pain. Then it's over.