We get to give
one bit of feedback to "the system" every four years. After four years of Trump, the feedback was "we don't want that". After four years of Biden, the feedback was "not that, either".
My impression of the US electorate is that they don't want illegal immigration, at least not in the volume and with the openness it was happening. They don't want immigrant trains rolling through Mexico. But they don't want the brutality and violence of the current crackdown, either.
They don't want trans people on womens' sports teams, and they don't want the US taking over Greenland.
And so on.
So after four years, the majority of voters were choosing "not Biden, and not the Biden things we don't like" rather than "yes Trump".
The place where it was "yes Trump" was the Republican primary. If you want to fix US politics, get involved with a political party - either one - and have some influence on who comes out of the primary process.