There are a few things you can do to increase the damage of your weapon in Elden Ring. One is to make sure that your weapon is properly Sharpened. You can do this by using a Whetstone on your blade, or by taking it to a Blacksmith and having them sharpen it for you. Another way to increase your damage is by upgrading your weapon at a Blacksmith. This will usually involve adding an elemental enchantment, such as Fire or Lightning, which will cause additional damage when attacking enemies. Finally, you can also use certain items and materials to buff your weapon's stats, such as Weapon Oil or Dragon Scales. If you have any of these items, make sure to apply them before heading into battle!