How to make a new Story Save

So, I wanted to make a new game, but not have to do it on an alt account. As many of you probably know, making a new account keeps your guns and locations, missions, etc. But if you put all your gear in your box, then delete your characters (yes, all of them, and no, it won’t delete your guns), then make a new game, you can restart the story with all your old gear. Not sure about PC or XBox, but it works on PS4, so I don’t see why it wouldn’t on the others.