Offering free shipping is a great hack to increase sales on eBay since people love free stuff a lot. However, only think of it after you've calculated the cost, and make sure to examine the options provided by your country's postal service. Small and light items can usually be sent at a flat rate that speeds up eCommerce shipping. By adding that to your final prices, you can cover the shipping costs and offer your customer a standard delivery service with no additional shipping charges.
If you are new to the platform and want to start out strong, free shipping might also be a great answer on how to sell faster on eBay. Offer it as a special promotion during your first stage, then replace it with other promotions when you reach a certain volume.