VN's are a B* to market because any beginner programmer can make one. But I actually love the look of yours! (the trailer anyways) it looks perfectly twisted. It's near impossible to get someone to purchase them unless you have a homerun. They say if a game will be successful you shouldn't have to do much marketing, it should fly by itself. So don't make VN's with the intent of making money. Sadly they are near worthless in today's society. Even if you have a story that wretches every persons heart who plays it.
There's a million places to market on the internet.. Yours is about a horror rave or something? That's prefect to find unconventional places to market it. Get away from the normal game sites where there are thousands of other VN's. Find the rave communities where they aren't oversaturated with games.. And frankly, probably don't even know what VN's are, or where the bar is set.
On the surface, my game is in the same boat as yours.. https://imitate-fire.itch.io/canna-bus
Cheers
edit: The fact is, if you don't have a hit game and still want to make money from it you have to go where the money is ie. Steam, where there are more players than devs who actually spend money on games.