You need to contact Hub support and ask them what is still missing.
Generally they offer feedback at the top of the unpublished hub.
It will say:
a) Overly promotional
b) Too many links
c) Duplicate content
d) Too many tags
etc
So that is your first guide.
Then go to the help tab and then down to Hub Rules point 2 (adult content) has a content them link - so I used that as it's a general email address.
They came back to me within a few hours. Were incredibly polite and helpful - which matched the email I had sent them, asking what else did I need to do, I was genuine in my desire to provide quality content and I wasn't sure what else was needed...
Good luck!
Caro
