When I want to start over a run, how do I reset the game without saving the game progress I've already done? I don't want to delete my file, watch the intro scene and exit to the world map every time I do a run.

Start a new file that has watched the intro and exit, then copy that file every time you start a new run. That way to reset you just copy let's say the file in slot 1 (the base file) over slot 2 (the one you do runs) and then start slot 2.

In addition, I suggest making another user on the switch since it prevents you from accidentally copying over your main file.

Okay, thanks! I play on wiiu so I probably will need another user for that since I already have 2 game files for casual completions