One way to enhance your skills in proofreading fiction is to analyze the works of great editors. See how they've improved various pieces of fiction. Experiment with different proofreading techniques, such as reading backwards to focus on individual words rather than the flow. Additionally, expand your vocabulary so that you can better spot inappropriate or incorrect word choices. And always be open to learning new things about language and literature, as this knowledge will surely contribute to your proofreading abilities.
To improve in proofreading fiction, study grammar and style guides specifically for creative writing. Join writing groups or workshops where you can get feedback on your proofreading. Also, try to read the text from different perspectives, like as a reader, an editor, and a writer. This multi - faceted approach can help you catch more errors. Another tip is to take breaks between proofreading sessions. When you come back, you may see things you missed before.