Is there a better design pattern for this requirement?

However, more user types can be added is also the requirement. It is not suitable to add more elements in the visitor pattern. What design pattern should I choose instead? Thanks!

Hi, I'm dealing with a design pattern problem: In a library system, admin can grant the certain permission of user information management (e.g., creating or searching user info) to other departments or schools. So I tried to use the visitor pattern. Users like teachers and students are the subclass of User and the admin or other department is the visitor.