aggrandizement - noun
aggrandize - verb
Aggrandize: to widen or increase in size or intensity; to make great or greater in wealth, power, honor, or rank; to make something appear greater.
Note: Both the noun and verb are often used with the prefix self-.
The historian’s job is to aggrandize, promoting accident to inevitability and innocuous circumstance to portent.
—Peter Conrad The Art of the City (1984)