Two listings for the same item can perform very differently: one sells in days, the other waits for weeks. The difference is usually the listing itself.
Take at least 5–6 photos in daylight, against a plain background and from different angles. Show the flaws too — it builds trust.
Include the brand, model and the key feature. For example: "iPhone 15 Pro 256 GB – Battery Health 92%".
Check similar listings and leave room for negotiation. To reach more people, consider the promotion options.