Yes, you can cancel and relist your tickets for a different price at any time before they sell.
To change your listing, visit the FAQ How do I edit or remove tickets listed for resale? for step-by-step instructions. You can relist them up until tickets for the event are taken off sale, which is usually a few days before the event (the latest we can accept listings is three days before the event). If you cancel your listing during this time, you won’t be able to relist at a different price.
If you have purchased additional add-ons (such as gift wrap/donations/parking/collector tickets) or additional international delivery, these can't be included in your listing price. When listing your tickets, we’ll always tell you the maximum your tickets can be listed for.