Hi! Selling privately usually gets you 10-20% more than showroom trade-in offers, but it takes more time and effort. For a 2021 GLE in good condition with warranty, you should definitely try private sale first — that's a desirable car and buyers will pay premium for warranty transfer. The main platforms for private sales in UAE are Dubizzle (the biggest, but lots of lowballers), Facebook Marketplace (hit or miss), and AUTO.AE
https://auto.ae/sale/car/all/ which has been growing fast. AUTO.AE is nice because it's more organized — you can list as a private seller, add detailed specs, upload multiple photos, and buyers can message you directly or via WhatsApp. The platform shows your listing to serious buyers, not just tire-kickers. For your GLE, make sure to highlight: GCC specs, remaining warranty period, service history with dealer, single owner if applicable. Take good photos — exterior from all angles, interior, engine bay, mileage on dashboard. Price it competitively — check what similar GLEs are listed for and price yours slightly below if you want quick sale, or at market if you can wait. Be prepared for negotiations — buyers here always try to get 5-10% off asking price.