Amember of has recently gained personal wealth and may experience status anxiety. such individuals may try to display symbols of their success to make up for an internal lack of assurance about the "correct" way to behave.

The answer is "the nouveau riche".

Nouveau riche"  refers to a term, typically disdainful, to portray those whose riches has been gained inside their own age, as opposed to by familial legacy. Nouveau riche individuals are individuals from a low social class who have as of late turned out to be exceptionally rich and get a kick out of the chance to demonstrate this openly by spending a considerable measure of cash.