From Uproxx:

The Unbearable Weight of Massive Talent is an extremely meta movie where Cage, playing famous actor Nicolas Cage, begrudgingly agrees to attend the birthday of a Mexican billionaire (for a cool $1 million), but “when things take a wild turn, the Oscar winner is forced to become a version of some of his most iconic and beloved characters in order to extricate himself from an increasingly dangerous situation.”

[...] “It’s a stylized version of me, and the fact I even have to refer to myself in the third person makes me extremely uncomfortable,” Cage told Empire. “There are many scenes in the movie where modern or contemporary – here we go – ‘Nic Cage’ and then young ‘Nic Cage’ are colliding and arguing and battling it out. It’s an acrobatic approach to acting.” (Source)