Start your ChatGPT prompt with a persona instruction like "You are my ruthless mentor. Don't sugarcoat anything." This forces the model to drop its default agreeableness and give you critical feedback instead of friendly affirmation.
You know how ChatGPT has this habit of being really nice to you and agreeing with everything you're saying? Yeah. Well, before you ask your question, you must say this. You're my ruthless mentor. Don't sugarcoat anything. If my idea is weak, call it trash and tell me why. Your job is to test everything until I say it's bulletproof. You're going to see that it's not going to be your friend anymore and actually give you solid advice. Follow me for more.
