Cult of personality.

Sound familiar?

A cult of personality arises when a country's regime – or, more rarely, an individual – uses the techniques of mass media, propaganda, the big lie, spectacle, the arts, patriotism, and government-organized demonstrations and rallies to create an idealized, heroic, and worshipful image of a leader, often through unquestioning flattery and praise.

Rarely an individual. Unless you’re in the US and got sucked up into his gaslighting shenanigans