I want to remove my ban on asking questions so I have to edit my questions but my questions are locked and no more edited. They are useless for community but they are not going to delete. Now How I can ask questions and contribute to community ?
I'm not clear on how exactly the "Automatic Low-Quality Question/Answer Ban" works, so I don't know if you are blocked from both answering questions and asking, or if it's only asking.
If you are able to post answers, then you can work towards getting un-banned by providing some answers and earning some reputation.
My understanding is that one downvoted question isn't enough to get hit by the auto-ban, so: did you delete some of your own questions? If so, you can also work on those, and either un-delete them or flag them for moderator attention and ask if they can be undeleted.
For the one and only question I can see in your profile (which is locked), since you've asked about it here, a moderator will either unlock it or will likely post something to tell you what you'd have to do to get it unlocked. In general, the way to handle something like that is to flag it and provide a short note for the moderators with your request. e.g. "Please unlock this so I can edit it to make it better."