gromcan You could just tag both notes, the old one and the new quick note one, with the same tags, so they would show up if you look for them. Then you don’t have to change anything in either note.
The use of folders is a matter of taste. I personally find, that having folders hinders my process of creating and searching for notes quickly, there is too much friction for me, if I have to think about in which folder a note goes or is. But nothing in the Forever Notes system prevents you from also using folders together with it.