"Up to here" is an idiomatic expression that means reaching a limit or being overwhelmed with something. Some antonyms for this phrase are "nowhere near," "not even close," "way below," or "not nearly enough." These antonyms denote a lack or insufficiency of something rather than an excess of it. For instance, if someone says, "I am up to here with work," its antonym could be "I have nowhere near enough work to do." Similarly, you could say, "I am not even close to my limit" or "It is way below my threshold." These antonyms serve as an excellent way to express a contrast to the original sentiment, providing a much-needed balance.