Resale price for bigger flats: what's the real hack?

Resale value for bigger flats in Greater Noida Extension is really tricky right now. I'm selling my old 4BHK near Sector 137, kids have moved out, don't need such a big place. Looking for a manageable 2BHK with an elevator. I found that checking recent registry values online for similar properties in your area gives a much clearer picture than just relying on agents. It helped me set a realistic price. Also, Godrej Properties and ATS ke projects mein low maintenance cost hai, suna hai. Any tips for finding genuine buyers for resale?