According to this question
Automatic bans never expire or "time out". This means that you cannot simply wait for a certain amount of time. If you do not take action, you will never be allowed to freely post again. The only way for the ban to be lifted is by contributing positively to the site in other ways. Mods can't help also.
What can you do?
- Focusing on improving old question instead of new ones
As you can see here some of your questions are lacking MathJax like this. In some question you have used MathJax but only in some maths tools try to use it for more tools.
- Do not delete your question
Like I have described here one should try to edit his question to make it better instead of deleting it. In case you have deleted your question until it is not total spam undeleted them if deleted by you alone and if it is deleted by other users with delete privelege just try to edit the question. In case you felt you have given your best and it is not undeleted yet ask for feedback over here in Constructive Feedback Room or ask for feedback to undelete in CURED chatroom.
Some special points-
If you're blocked from asking questions and are unable to improve your existing questions (or your existing questions are all deleted), you'll get the chance to post one new question 6 months after your last question. Your block will still remain once that question is posted, but a single positively-received question could be enough to lift you out of the block. (This does not apply to answer bans.)
If you are banned from asking questions, then writing a few quality answers that get upvoted might enable you to ask questions again. But as the internals of the filter are secret, there is no way to know for sure.
You can know more about question and answer ban and how to get out from that ban through this answer