Having uninstalled the app without having solid re-entry information makes things very difficult as communication with support is required. Before I go further (Do not post the information I will ask you about on this forum! These are items you may need to establish your ownership to Your account.)
Having cords to your castle including Platform (Facebook or Plarium Player games ) Server your castle is on ( Dark Plains , Untamed Lands or Farwol's Crown ) Any past Account purchase history and Credit card proof reciepts. The original e-mail address and password log in information (Even if it doesn't work now) and have a new E-mail and Password Ready to give to transfer the account. you may need to start another game with a different E-mail to use as a go between account as you verify your ownership of your original account.
then contact support with your go between Or Another account if you have one and explain how your e-mail from the other game is no longer an option and your need to transfer the account to a new E-mail
Here is a link https://social-support.plarium.com/hc/en-us/requests/new?ticket_form_id=168205&fbclid=IwAR0rWnxKHZXxrhNSqGsDh5tWogavQUynr71DjYNrXsDMhOFcMi43vv6tGvc