You can rarely appeal a permanent ban but if you want to try an appeal then contact customer services.
They 'may' pass it to the back office but the chances of the appeal being successful are slim. Paypal state that the decision is not made lightly and once made is usually final.
https://www.paypal.com/us/cshelp/article/how-do-i-contact-paypal-customer-service--help378
PayPal does review accounts regularly, and any concerns with security, violations of the User Agreement or Acceptable Use Agreement, compliance obligations, etc., could lead to a permanent restriction. Additional information beyond what would have been provided to you in a notification and/or email would not be available due also to security concerns...in other words they do not give you an exact reason, they just direct you to the user agreement or acceptable use policy. I guess having a reason wouldn't make any difference if they have permanently banned you.
