While trying to ask a question, one could get:
We are no longer accepting questions from this account. See the Help Center to learn more.
This is of course something counterproductive towards a single user, but for the best of the community. Seeing as individual users are barred from asking further questions they go looking for ways to regain that ability. The solution for that always boils down to getting a positive record again. Something that can be achieved by improving ones existing questions, or adding new positively scored questions to your account.
The latter should not be a viable option, as the user is at that point banned from asking new questions, with the exception for one new question every 6 months.
Recently in a comment thread a user proposed the following way to redeem yourself from a question ban:
...you can ask questions anonymously(without logging in somesites), then after receiving the upvotes (1 is sufficient), you can request a merge which will be done immediately
It is true that in some cases an automated merger is triggered. This is something that isn't very well documented at all (which might be for the best of it).
I wonder if this is currently a viable option to get your question ban lifted. I, for obvious reasons, don't feel like testing this in practice. Therefore any "official" answer is appreciated.