Wikipedia:Should I fork?
This is an essay.
It contains the advice or opinions of one or more Wikipedia contributors. This page is not an encyclopedia article, nor is it one of Wikipedia's policies or guidelines, as it has not been thoroughly vetted by the community. Some essays represent widespread norms; others only represent minority viewpoints.
Q: Should I create a separate, new, better version of this essay/template/article/other thing?
Instead, improve the existing version, or if it's totally unsalvageable, replace it. Forking adds to the maze of redundant pages on Wikipedia, bringing myriad problems, and creates work for other editors who later try to consolidate them.