tl;dr
The performance of most brands is way too dependent on a few creatives.
Stop focusing on just replicating individual creatives, but start to understand what works best across the your entire creative library.
They key to generate this learning is a rigid naming convention that allows you to analyse performance based on the characteristics of the creative.
Once that is done, you can create a much more diverse set of creatives, speaking to different target groups while still understanding what works.