Finding the right keywords takes time and testing different combinations to see what actually drives traffic. You're basically competing with thousands of other sellers for the same search terms, so getting the title wrong means your listing stays buried. Try this eBay title builder
https://easync.io/ebay-title-builder/ . It analyzes what keywords perform well for your product type and helps you structure titles that get visibility. Automates the research part so you're not manually checking every competitor's listing or guessing which terms buyers are actually typing into search.