If I were EA/Bioware, and I was determined to “save” Anthem at all costs (which I doubt EA really are), I would go almost completely silent for the next YEAR, at minimum. People will think the game is 100% dead. Some people might even be more mad than they already are.
Take that time to “fix” the game - make drastic alterations to it’s structure, build out the content, expand the story if you can, squash bugs, learn from what people have said these past four months, based on honest introspection that doesn’t blather about “magic” and so on.
E3 2020 rolls around, and Casey Hudson takes the stage at EA’s conference. Speaks honestly about the failures of Anthem when it launched over a year ago, the challenges the studio has had overall, and that they needed to take time to re-assess.
Then unveil Anthem v2.0 as the game Anthem should have been, and the vision they originally saw in their heads. Show off how improved it all is - seamless loads between indoor and outdoor areas, Fort Tarsis is now an actual social space on the open map, those giant walker things are actually moving around on the map. You can encounter other AI freelancers out in the world in random events, doing contracts of their own.
Lay out a basic-but-exciting roadmap for what is coming well into 2021, and make it clear that you’re committed to delivering on all of it. Announce some sort of “make good” for all of the people who bought in on Anthem in 2019, when it was a mess - unique cosmetics, whatever.
Something big and loud like that, would garner a lot of media attention and interest. Just incrementally making the game a little better every couple of months or whatever, will not
Will they do that? No. But if you are willing to do anything to save the game, that’s how you do it.