No upgrade feature for lower levels. No reactivate expired account in Pro Sites

I have an account I am testing. The account has been given the lowest level of a 3 level ProSIte. There is no "Upgrade" option button promoting upgrade to a higher level. The "Upgrade" option button only seems to appear within a FREE LEVEL site.

Also, if someone lets their account expire, how do they re-activate their account? I tested the same account using "Cancel my subscription." The subscription is cancelled but, I cannot reactivate the account. When I visit the ProSites pricing checkout page when logged in it only shows all fields to set up a new site and new subdomain. There is no option to simply re-activate the existing subdomain (site). Please assist. Thanks!