What's the noun for holistically? Here's the word you're looking for.
holist
A believer in, or practitioner of, holism; one who believes that a topic of study cannot be fully understood by studying the parts, or who studies by considering the whole.
(sociology) One who advocates studying society as a whole, and who consistently interprets the actions of individuals in that context.
(education) One who prefers to learn by forming an overview of the topic.
holism
A theory or belief that the whole is greater than the sum of the parts. [from 1926]