Won't reset, not even time-travel. Animal Crossing is meant to be a life simulator, and in real life, there ain't no Reset button to make sure you make no mistakes, right? If you really rely on resetting in Animal Crossing, then you need to be more comfortable with making mistakes and just...letting them be, ya know? Yeah, so you didn't like what you got, maybe you made the snowman's head too small and now it ain't perfect. That's life!