The phrase "be conventional" refers to conforming to generally accepted standards or norms. Synonyms for this phrase could include "follow the norm," "adhere to tradition," or "stick to the status quo." Other potential synonyms could be "play it safe," "avoid rocking the boat," or "maintain the status quo." Those who seem to be conventional often avoid taking risks or straying outside of established boundaries. Alternatively, one could use the word "conformist" as a synonym for someone who always adheres to conventional norms and rarely challenges the status quo. Regardless of the synonym used, the meaning remains the same: a desire to conform, rather than stand out.