There are a plethora of synonyms for the phrase "collect additionally." Some alternatives include "gather more," "accumulate further," "amass extra," "pull in supplementary," "harvest beyond," "hoard in addition to," "stockpile on top of," "compile added," "round up additionally," "pick up on an extra," and "collect in excess of." All of these phrases indicate that more than has already been obtained or garnered is being acquired. Whether you are adding to your personal collection or obtaining additional information for a project, these synonyms can keep your language fresh and varied.