Narrative writing mechanisms

Unfortunately, the term postmodernity applies to everything (and I see postmodernity as proposed by the Americans, that is, as a literary concept. Not the general concept introduced by Lyotard). I believe that this term is used by everyone according to their preference. On the other hand, it seems that there is an attempt to apply it to the past, because before that, this term was only applicable to some writers or artists belonging to the last twenty years, but it gradually came to apply to writers from the beginning of the century, and its scope expanded more and more. It is not unlikely that Homer could be described as postmodern. I believe that postmodernity is not a trend that can be chronologically defined, but rather a spiritual concept or a way of working. It can be said that each stage and postmodernity have their own characteristics, as each stage was created by them, even though I wonder if postmodernity is not just a modern name for craftsmanship as a meta-historical concept.