I don't know about news, I wish I could help you with that. I think there might be more news sources on Mastodon as the recent migration from centralized social medias occured, but I'm not sure. It can sound like an echo chamber, I relate to that, but feed curation is what drives your main page.
To me though, that is not what twitter was for. It was for getting news about events from various places, not from a narrow echo chamber.
I looked at Mastodon maybe a year and a half ago, and was like "wait, it's all just for one subject, it's like discord, but somehow worse"
I don't know about news, I wish I could help you with that. I think there might be more news sources on Mastodon as the recent migration from centralized social medias occured, but I'm not sure. It can sound like an echo chamber, I relate to that, but feed curation is what drives your main page.