This is more of a social statement, rather than a real movie. Mostly because there is a lot of subtle (and not so subtle) social commentary, while the plot at some point just goes nowhere, really, and makes the ending feel weak.
It explores effects of sudden fame, resistance to it, as well as submission to it (almost drunkenness on it), and inevitable cancellation, because of the crowd's perception of you, rather than the actual you. If you stop and think about it it's a good example of what our society has been becoming the past couple of years.
Cage is amazing in his role (or should it be "roles"?), he is definitely tapping into his weird side here, which works great for the movie. But overall there is little character progression, or at least little of the obvious one. One hand that's realistic, but on the other hand it is one of the minute details that contributes to somewhat disappointing ending which came to us after a time skip.
Personally, I would have preferred the movie to be 10 to 20 longer only for it to cover what happened during that time skip, so that character transition would more seamless and, possibly, more relatable.