Issue with user role and registration form

I have two types of user for registration, one subscriber another is writer. Subscriber user need to verify the email address and writer required admin review. In registration form there are few fields which are required to become writer, those fields are hidden if user role subscriber is selected. When user submit the form, the page reload and nothing happen (registration unsuccessful) But when user role writer is selected on this page there are error message with those required fields.

Another issue is subscriber can become writer by changing the user role using the role radio or dropdown option. Writer role is set to require admin review but when users change the role they instantly become a writer without admin review.

Is there any way to use required fields with logic. and use admin review and put account in pending if role is changed