I actually think most fvn writers don't have arrogance problems, but instead an inferiority complex that's shielded by automatic accusations of "hater!". When you're surrounded by yes-men, any criticism or friendly suggestions will seem like hate. That's literally the only suggestion i'd give them. Realize you aren't a master novelist because a few people liked staring at your wolf's tits. I've seen quite a few writers say something like: "what do you know? I'm the one here with a popular vn!. It's like they forgot people can criticize games they play, even if they aren't game developers themselves. The old saying goes: Customer is always right. It doesn't mean that exactly, but it means that you should take the words of customers seriously. Even people who don't know how to criticize will still provide some insight into the story's problems if you know how to understand their reviews. As an example, if half the people reading your story are confused about some plot point and are wrong, it's the fault of the writer for not realizing he explained it poorly, not the fault of the readers. But if only 1% of readers didn't understand, you could say it's the fault of those few readers. This is why writers need to take all cricitism seriously. If they just shrug of those half readers that didn't understand the plot as dumb, they will end with a story nobody understands.
Oh and another comment said vns don't need plot. You might be right but those vns like nekojishi are years old and there weren't many options back them. A fvn with weird taiwanese gods (was it?) was really interesting. These days i think it would flop hard. There's still market for pure SOLs but i think these days you need some gripping plot to really make it popular. And nekojishi actually had plot, so that was a weird example, EA and other dating sims are a better example. Hell i think the market is kinda saturated right now overall, i noticed lots of very good vns completely flop