The canonical answer to this is on Meta Stack Overflow, which is where the link in the notice takes you:
An automatic filter is in place to ban questions from IP addresses or accounts with a history of extremely poor questions. To avoid bypassing the filter its internal rules are a secret, but it is partly based on downvotes cast by other members of the communities.
Once you have posted too many bad quality questions, you will be banned from asking more, and see the error message. You can then still use the site, except for asking questions.
Looking at your profile, you've asked 6 questions, only one of which has been upvoted, 4 of which were closed, and 3 of which were deleted. You've provided few answers, and only one of which was up-voted.
If you'd like to ask questions in the future, focus on helping others first by providing high-quality answers and taking the feedback you've received on your past closures to heart. While the details of the low-quality ban are purposefully kept secret, creating a trend of high-quality answers generally will help towards getting it removed.