You can find lots of news and journalism accounts sorted into categories on the Fedi.Directory website:
➡️ https://fedi.directory/news-media
To follow an account listed on the site:
1. Every listing includes the account's Fediverse address. Copy this.
2. Paste the Fediverse address you copied into the search box in Mastodon etc.
3. The account's profile will appear, where you can click "Follow".
If you have any questions, please ask!