In the old days of MathOverflow, community wiki status was irreversible. This is no longer the case! There are many old questions and answers that became community wiki by accident or other reasons. For example, I had turned my first MathOverflow answer community wiki just to see what the button did.
Post requests for removal of community wiki status here. You can get a list of all your community wiki posts with this data query.
PS: Removing community wiki status is not an edit, so don't worry about bumping old questions.