You can set the relist duration on your eBay listings to Good Til Cancelled(Default), 30, 10, 7, 5, or 3 days. Changing your relist times could give you the competitive edge you have been looking for. You can update your listings from the Edit Listing Page or via Bulk Edit Templates.
On your Edit Listing page you will find a drop down on the left side of the page towards the bottom.
Update your eBay listings via Bulk Edit Templates by downloading a Listings Edit template and filling out column W with one of the following options: