Finding real value in Greater Noida now, confused about timing

Not proud of this but I almost got duped by a pre-launch scheme. I'm eyeing a 2BHK investment in Greater Noida, specifically around TechZone IV, maybe Divyansh Infraheight Pvt. Ltd. if the project is solid. My budget is ₹70-80L. Everyone talks about Jewar Airport appreciation, but I'm wondering about current value. Kahan pe abhi bhi real price correction zones hain? I'm an investor, so ROI is key. Also, builders often say 'fixed price', but I've seen spot discounts happen. Kitna realistically negotiate kar sakte hain on a 2BHK in this range? Should I wait for a market dip, ya yehi best time hai? What's your take on spotting truly underpriced assets here?