Depends on the type of immorality. Do you continue to age? If no, what age do you stop? Eventually the universe will die. So what happens to you then?
It might be fun for a while. Maybe even a long while. But that fun will be gone in an instant compared to the trillions and trillions of years you will float in a dark dying universe of nothing.
I’m likely average, middle of the road intelligence. Smart enough to get by and dumb enough not to excel at anything. I know a little about a lot of things and not a lot about one thing.