Psychological terror is good, even if it does not contain supernatural aspects, an example of this is the book Rose Madder by Stephen King, which describes in an extremely disgusting detail an abusive relationship, the escape, the feelings that surround the character, everything is well characterized. Everything just right.
Another piece of advice is more focused on naturalistic literature, such as "O mulato" by Aluíso Azevedo, as well as "O cortiço" and "Casa de Pensão" by the writer. It is interesting to portray some question of our reality or to characterize how Machado de Asís does in "Dom Casmurro".
But the important thing is what you want to write, not what others want you to write, but I hope I helped anyway.