I often use the strategy of studying competitors - look at what they sell and how many sales they have. This way, you can understand what is really in demand. And you can also try searching for products by popular search terms, that helps too

Hey! To find out what's hot on eBay, start by looking at the top categories and seeing which items are flying off the shelves. It’s also useful to watch for trending products and what other sellers are pushing hard. There’s a solid guide on finding the best top selling items on eBay that explains everything you need to know. Check it out here: easync.io