Cursor doesn’t have a feature that lets you automate sending prompts.
However, you might be able to make this work with just a single prompt. Depending on how many blogs you have, you could add every blog with the @-reference to your chat message or use the codebase context feature (make sure to enable the “Reasoning step” in the advanced codebase context settings to improve the results). Then, you could ask for what you want, and it might give you all suggestions for every page in one go.
Regarding actually editing the files, you can use the /edit slash command in Chat. However, it doesn’t support editing multiple files at once yet. So, you would need to focus on one blog file, have the chat opened that has the suggestions (/edit sees your conversation history), and say something like “Apply the changes for this blog.”.