Say I asked somecrappyquestions (yes, I've done that) and they got downvoted (rightfully so).
Now say I edited them to provide an MCVE, or a clear problem statement, or whatever was originally wrong with them. Now I've got a (hopefully) good question on my track record, but with a lot of downvotes. This is quite the blemish on my reputation and profile.
How can I get un-downvotes (or upvotes) on these questions?