Imaginary lines called borders tend to be the biggest constraint.
You and I both know it's not always that simple.
Maybe the author just loves to complain and actually does not want a solution.
Because “just” is doing some heavy lifting.
Trying to immigrate to another country takes a lot of money and time and may have various other requirements.
Maybe the author is opposed to that kind of freedom.
He can fix them.
I’m too lazy to go back and find your Biden era bitching and tell you to do the same, but if we all followed your advice the place would be empty.
It wouldn't, because the vast majority of people whining about how terrible the US is and how great it is elsewhere aren't welcome elsewhere because they aren't a net benefit to their community.