When you try a new recipe and it turns out to be something amazing, let's say a mouth-watering homemade lasagna, you don't make it once and call it a day. It becomes part of your dinner rotation because you know every time it pops up on the menu, a satisfying meal awaits.
Think of your creative marketing assets in the same light. When you create an ad that gets people talking, thinking, engaging, and clicking, it's best to serve it up again to get the most bang for your creative buck.