By and large is a commonly used phrase that means mostly or generally. If you want to avoid using this phrase and sound more interesting or diverse, there are several synonyms you can try. Some alternatives include "generally speaking," "on the whole," "for the most part," and "largely." You can also use phrases like "in general" or "overall" to convey a similar meaning. If you want to emphasize a particular aspect of something, you might use phrases like "predominantly," "primarily," or "mainly." By exploring different synonyms for this phrase, you can add variety and depth to your writing and communication.