For months, I used ChatGPT almost daily as a friendly partner. Yet I somehow ignored one tiny setting that could have made everything smoother: Custom Instructions. Once I finally started experimenting with it, my answers became sharper, more relevant, and more “me.” It was like giving ChatGPT split personalities as I could dial into different voices whenever I wanted. Even if you are a ChatGPT beginner learning to write prompts, set up this underused feature and shape ChatGPT into a personal assistant that actually sounds like it knows you.