As I recently received a question ban, I went again through my questions to improve them. I have a total of 3 questions which have no accepted answers (1 off-topic (deleted), 1 without answers, 1 without an answer which actually answers the question). Many of my questions have no votes at all (6/11, including the deleted ones). Also I have at least 3 questions with more than 5k views.
As I said, I went through all my questions and tried to improve them. In the end I only improved 1 question, which promptly lead to another downvote on the question. All other questions are pretty exhaustive or at least describe the desired answer detailed enough to get the actual answer (see this question). As the questions are either already answered or the desired answer is clearly described, I have a hard time to improve them in any meaningful way (not just random edits to bump them to the active questions).
So my question is, how should I improve my answers in a meaningful way to lift my question ban?
My current upvote downvote ratio is 6/15, including the deleted question. Is it necessary to even the ratio out to lift the question ban, or what are the requirements?
Please note that I know that questions should show a minimum effort of research, yet again I learned from stackoverflow that questions which are easy to answer, but not yet present on the stack are valid as well to build a collection of knowledge in a central place which else would be scattered around many places.