Recently I would like to ask a question but it showed up "I've reached the question limit", what should I do to remove my ban?
According to the Help Centre, you should start by improving your existing questions. This means that you should try to make your questions as clear and specific as possible. However, if you are unable to improve your existing questions, you are given a chance to ask a new one about half a year later, before you are banned again from asking questions. However, if the question is good enough, you might get unbanned and you can continue asking questions. Hope this helped.