The word "unalleviated" means not lessened or softened, so its antonyms would be words that suggest some kind of relief or reduction. "Alleviated" itself is a good place to start. Other antonyms might include "mitigated," "eased," "tempered," "relieved," "reduced," "lessened," "moderated," or even "ameliorated." Each of these words suggests some kind of improvement or lessening of a difficult situation or problem. So, if you want to convey the opposite of "more unalleviated," you might select one of these words to express the idea of something becoming more manageable or bearable.