Journalism can be improved by no longer restricting what is printed or broadcast. If there is a story that journalists find to be interesting or worth telling, they should be able to publish those stories, no matter if they may shine badly on other people.
There are many stories which never get to see the light of day or be read by anyone else simply because the editors do not see it as being a good story or may cancel it because it could shine badly on supporters of their company. Complete trasnparency would be a great start in improving journalism.