Increase education funding, mandate a couple of levels of free choice liberal arts/philosophy type courses to ensure people have to expand their thinking a little, focus on critical thinking and media analysis skills in primary and secondary education - not as the main focus but certainly as important, civic building classes.
News media gets harsh anti-monopoly rules: no more billionaires owning every station in every jurisdiction, in fact no more conglomerates whatsoever. More independent funding for local news: I'm content for a bunch of these to go bankrupt on a regular basis but we'll sponsor more people putting out independent journalism.
At an international scale spin off an entity like the Federal Reserve which would be the Federal International Reporting Bureau with some iron clad rules about funding changes and the sole mission to baseline the availability of boots-on-the-ground international journalism, with a mission charter the citizenry must have accurate reporting to understand how they will choose leaders to guide international politics. This one would be tricky to get right, I suspect you'd probably end up tying resource allocation to government funding alotments and the like via some automatic mechanisms.
The first and last are probably pie in the sky: really let's start by shredding a couple of media empires into 50 different fiefdoms and let them battle it out for views, but there'll be no more mergers or cross-media ownership that's for sure.