Write the book you want to read.
If there’s something you don’t like in books, make a point not to put it in yours.
If there’s something you think modern books need more, put more of it in yours.
It doesn’t matter if it doesn’t fit a specific genre completely. It doesn’t matter if absolutely nobody else likes it. Just write the thing. Write it for you, because you’ll regret it forever if you don’t.
Write what you want to write and screw what anyone else says.