Why does nobody remember me in this world in manga?

Well, it might be that the story has some sort of mind-altering element that wipes people's memory of you. Or maybe it's a test for your character to overcome this lack of recognition and make a mark.

Maybe it's because you haven't made a significant impact or left a lasting impression on others.

It could be that the world in the light novel is too big and chaotic, and people have their own concerns and distractions. So, it's easy for them to forget about you. Also, if your character doesn't have standout qualities or actions, it's harder to be remembered.

Maybe it's because your character is not significant enough or hasn't made a lasting impression on others in the manga's plot.

Perhaps the themes or characters weren't engaging enough. Maybe it was released at a time when there were many other popular manga stealing the spotlight. Or it might not have been available on popular platforms where people tend to discover new manga.

Maybe because people are too busy with their daily lives. They have to work, study, and take care of various chores. There's little time left for reading stories.

It could be due to the fact that there are so many different interpretations of Hermione in fanfiction. Some might not like the way she is portrayed as being too perfect or too flawed in certain stories. Also, if the fanfiction doesn't add anything new or interesting to the existing Hermione character arc, it may not attract readers.

Perhaps it was overshadowed by other more popular novels at the time. Or, its themes and storylines were too niche to capture a broad audience's attention and memory.

Well, usually it involves a lot of challenges and growth. The character starts from zero, gains skills and experiences, and overcomes various obstacles along the way.

It often involves a series of challenging adventures and lucky breaks. The character might encounter helpful mentors or discover hidden powers along the way.