I recently asked this question because I found answers to previous versions of the question unsatisfactory. I phrased the new question in a way that referred to the old questions and made clear why I was asking again. The answer that I received was better than previous answers and, I believe, would have been considered so by those who posted the old questions.
I stumbled across various versions of the old questions mentioned and I now think that it would be useful for these to refer to my question so that users who encounter the problem are aware of what I think is a better answer.
Is there an established protocol for this situation? Should I comment on the old posts with a link to my own? Or should I let the voting system sort things out naturally?