The phrase "ran out of" implies a lack of something that was previously available. Some synonyms for this phrase could include "exhausted," "depleted," or "drained." These words carry a similar connotation to "ran out of," but can add a bit of variety to your writing. Other options might include "used up," "emptied," or "ran dry." Depending on the context of your sentence or paragraph, certain synonyms may work better than others. In any case, using synonyms can help diversify your writing and keep your reader engaged.