How to change the local.system.replset configuration. The current host does not belong to this replset

The current logged in user does not have access to add new users. The current host is not in the replset and it is in REMOVED state. The hosts in the replset do not exist anymore. I want to delete existing replica set info and initialise a fresh replica set with the current host. However, the user does not have access to getUsers or add/edit replSet information or drop local database.
Can you please suggest what to do.