The antonym for the phrase "more decreased" is "increased." When something decreases, it becomes smaller or fewer, while the opposite of that is when something increases it becomes larger or more. Thus, when talking about quantities or numbers, "increased" would be the antonym for "more decreased." In a broader sense, antonyms for "more decreased" would depend on the context, but words such as "expanded," "grew," and "developed" might be applicable. Nonetheless, "increased" remains the most straightforward and direct antonym for "more decreased.