Lawn mower blade

This blade has only been used three times, and it's already looking worn. I have a lot of rubber mulch in my yard, and it gets blown in by the wind during storms and when I'm mowing weeds, and it ends up in the mower.
Should I sharpen it or remove the mulch first?
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After clearing the area, carefully inspect the blade. If it's only slightly dull, sharpening is usually sufficient. However, if there are chips, noticeable nicks, or deformation, it makes sense to replace it. For decks with the width shown in your photo, see https://udcparts.com/products/udc-parts-low-lift-blades-601124-54-inch-fits-hustler-replaces-oem-no-797696-797704-601013-602416-797712-3-pack . This is a low lift 18½" blade set that fits many models.