How to dance the ghost step for four people?

You can do this. At first, four people dance together. After the dance, the other three people have an exit show and retreat to the side, leaving one person to dance by himself. Then the remaining three people go up to perform their solo shows in turn. When everyone has finished performing, you can end the performance directly, or have another dance together.

but be careful, if you have different styles, don't dance, it will be ugly. Or you can take small steps when you dance together and dance your own style when you show yourself.