Well, one way is to use detailed descriptions of the character's body language and non-verbal cues. Also, have the other characters interpret and talk about what they think the silent character is feeling or wanting. This can give depth to the silent character's story.
Start by reading a lot of well-written stories. That'll give you an idea of what works and what doesn't. Then, practice regularly, even if it's just a few paragraphs a day.
To write better fiction, start by developing interesting characters. Make them complex and relatable. Then, create a compelling plot with twists and turns. Pay attention to the pacing and build tension. Finally, polish your writing with vivid descriptions and clear language.
To write better fanfics, start with a clear plot idea. Build a world that makes sense within the original framework. Pay attention to grammar and spelling.
Plan your story thoroughly before you start writing. Know your characters' motivations and goals. Also, make sure the plot has a clear beginning, middle, and end.
To write a better novel, start with a compelling idea. Develop interesting characters that readers can relate to. Also, pay attention to the plot structure and make it engaging.
The key to writing a better story is to read a lot. It'll give you ideas and show you different writing styles. And don't forget to revise and get feedback from others to improve your work.