Antonyms for the phrase "builds up on" could include phrases like "reduces," "decreases," or "diminishes." These words suggest a process of breaking down or cleaning away, rather than adding to or accumulating. Alternative phrases could also include "cleans off," "wipes away," or "removes." By focusing on removing or reducing instead of building up, these phrases suggest a process of streamlining or simplifying, rather than accumulating more and more. Whether working with physical objects or abstract concepts, it's important to consider what the opposite of building up might be, in order to achieve a balanced and sustainable approach to life.