Further to Womble's answer:
This is the definitive Q&A about question and answer bans:
What can I do when getting "We are no longer accepting questions/answers from this account"?
A few important points:
You've been banned from asking questions, you can still post answers.
There is no way for a moderator or for an SE staff member to un-ban ...
The six deleted questions probably also have something to do with it. But nobody -- not even the site moderators -- can see the exact reasons why an account is blocked from posting, so if you need an authoritative answer, your only recourse is to contact Stack Overflow staff.