The phrase "part and parcel" typically refers to something that is an essential component or inherent aspect of a larger whole. If you are looking for synonyms for the phrase "more part-and-parcel," you might consider using phrases like "greater integral component," "more essential element," or "increased fundamental aspect." Alternatively, you could use words like "critical," "vital," or "indispensable" to convey the idea that the item in question is absolutely necessary for the larger whole to function properly. Whatever word or phrase you choose, be sure to use it in the appropriate context to convey your intended meaning.