Your answer doesn't make sense to me, Frigid. Why would adding four more political parties make media any less partisan than they are at the moment?
Imagine you're a voter.
You have a choice between two different parties.
One party you can't stand. So you vote for the other party.
What do the two parties need to do to get your vote? Negative messages. "The other party is bad". Simple as. You can see both sides doing it. Trump makes it easy for the Democrats, but Trump spends a lot of time telling everyone how much he hates people, hates Kamala, deliberately says her name wrong. Comes out saying he hates Taylor Swift. Etc etc.
There are some positive messages, but mostly they're just that, messages without substance. Obama "hope not hate", Trump "make America great again". Again, no substance, Obama didn't do anything with his message, Trump didn't make America great again, according to himself.
Look at Germany. Say you're right leaning, but you're pro-choice for abortion. In the US you vote Republican because you're right leaning. This means that the Republicans keep up the anti-abortion message because.... it doesn't harm them.
Now in Germany, you might have one party that is right wing and pro-choice and one right wing party that is anti-abortion. So, people can have better choices.
So, if you're a politician, you have to make the right choices. Otherwise your party dies, and it happens. The FDP, center right party go no seats a decade ago, because either the other right wing parties said something people likes, or this party didn't say what people wanted them to hear, or the previous 4 years they didn't do what people wanted.
So, each political party has to be more sensitive. They have to stand for something. In Germany everyone knows, more or less, what each party stands for. There's no point in being negative. You have to be positive about your own message.
So the media is going to be more positive about things too. They might stand with one party, or one wing, and pump that positive message.
Money plays a HUGE part in US elections. The most expensive senate seats cost more than the WHOLE Germany federal election. Why? Because pumping that negative message costs money. They're manipulating people.
In Germany that happens less. Why? Because you're standing on a platform, not shouting at your one and only opponent. To shout at five other opponents (or more, there are regional parties too), would take too much effort and people wouldn't vote for your negativity.