Grammarly’s a quick way to make bulk changes and avoid the detection of ChatGPT. Use GPT playground: Put it in “Chat Mode” (top right hand under examples), select GPT-4, paste your content in the left hand side and prompt in the user input. Set the temperature high (8.0 – 1.0), and prompt something like this:

https://www.reddit.com/r/ChatGPT/comments/13ibcnw/to_what_extent_does_turnitin_detect_chat_gpt/