I depends what you mean by "alternative sources". Lot's of places still have local papers that are pretty good for local news. There are international papers that have a different point of view to the American corporate press, which is quite useful from time to time. There's also good bit of quality opinion and some reporting on substack. And then there are some select reporters that have a narrow beat who do great work in their niche, but may work for a place that is overall questionable.

American news consumers should be critical, and pay attention to times when major competing news outlets are running the same headline about a complicated story.