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Auto comment: topic has been updated by EvenToWorldFinal (previous revision, new revision, compare).
As mentioned in this blog, you have to be at least 2100 to be a problem author of a Div. 1 or Div. 2 round. Div. 3 used to be prepared by the Codeforces team only, but recently I have seen many new faces setting Div. 3 rounds so if you want to propose a Div. 3 round you can always message the Codeforces team to ask.
On how to spark incredible ideas for great problems, there have been many blogs written by experienced problemsetters before. You can read them all in the Codeforces Catalog, which sadly it seems like many of us don't remember or know its existence. The Catalog is filled with tutorials & techniques though and you have to scroll all the way to the bottom to see the Problemsetting section.
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