The phrase "do something once too often" implies a negative connotation, and can be replaced with several synonyms that better describe the action. For instance, the phrase "overdo" reflects the idea of taking something too far, while "overuse" indicates excessive repetition. Another possible alternative is "abuse," which conveys the harmful effects of repeating an action without restraint. "Exceeding the limit" also highlights the idea of crossing a boundary, whereas "repetitive action" emphasizes the act of doing something repeatedly. Whether in writing or speech, using synonyms adds variety to the language and allows for a more nuanced expression of ideas.