Sys Admin lost access to community

Below the link how to add system admin (yourself) to community to be able to manage it.

https://help.salesforce.com/apex/HTViewSolution?urlname=How-do-I-add-myself-as-a-member-of-a-Community-if-the-Manage-Link-is-missing&language=en_US

Hi Try to get in touch with salesforce support team. They are the omnly one seems like will be able to help.

call them on 1 (800) 667-6389 here is there number. or contact them through email on using this link https://www.salesforce.com/form/contact/contactme.jsp