Media literacy was never the problem, because it wasn't actual confusion about what was real or not that was drawing people to the extreme alt-right sphere, it was confirmation bias that allowed people to choose not to critically assess the content for veracity.
But I don't think you can solve this through "media ecology" either. Curating this volume of content is impossible, and there are legitimate dangers in giving the government too much ability to shut down free speech (see Germany condemning any form of pro-Palestinian rhetoric as antisemitic) in order to guard "truth".
I think that this is similar to the issue of biased GenAI; you can't fix bias at the human-output side, you have to build a society that doesn't want to engage with bigotry, and explore and question its own assumptions (and that's not ever a fixed state, it's an ongoing process).