It might be due to the quality of your writing, although this doesn't mean it's bad. It could be that there are some areas that need improvement, like grammar or pacing. You could ask a friend who's good at writing to give you some feedback. Also, the genre you're writing in might not be as popular within the fanfiction community you're targeting. Consider exploring different themes or styles to see if that attracts more attention.
First, make sure you're posting in the right places. If it's a very specific fandom, find the most active platforms for that fandom. Second, ask for feedback directly from your friends or family who are into the same kind of stories. They might give you some insights. And don't be shy about sharing your work on your own social media accounts as well.
I haven't seen any reviews yet as we don't know which new novel it is. But given Coetzee's past works and his reputation, there's a good chance it will receive critical attention and potentially good reviews if it lives up to his previous standards.
One benefit is that it can help you improve your story. Reviews might point out areas that are unclear or need more detail. Another is that it gives you different perspectives. People from different backgrounds may see things in your story that you didn't notice.
I'm sorry, but I have no idea about the reviews of Howard Stern's new novel. It could be that early readers love it for its unique voice and engaging story. Or, it could face some criticism if it doesn't meet certain expectations. Only time will tell as more people get to read it and share their opinions.
At present, without more details about Tobias Wolff's new novel, we can't accurately say whether it's getting good reviews. His previous works have been lauded for their literary merit, so the new one may follow suit. But factors like the story's relevance to contemporary issues, the uniqueness of its narrative approach, and how well it resonates with readers will all play a part in determining the critical reception.
I'm not sure of a specific fanfiction on this topic, but you could start by looking on platforms like Fanfiction.net or Archive of Our Own. Just search for 'Charlie Weasley Harry Potter pregnant' and browse through the results. There are likely to be various takes on this idea in the vast world of Harry Potter fanfiction.
One way is to share it with a writing group. They can offer diverse perspectives and constructive criticism. Another is to post it on writing platforms where readers often leave reviews. Also, ask friends or family who are avid readers for their honest opinions.