boosterism

US /ˈbuː.stɚ.ɪ.zəm/
UK /ˈbuː.stɚ.ɪ.zəm/
1.

부스터리즘

the quality or act of being very enthusiastic and confident about how good or successful something is or will be, often more than is reasonable:

:
The mayor constantly boasts about the city's cultural richness, but boosterism alone only gets you so far.