Different news

Did you try creating a news post from SharePoint home? You can publish the news to either hub or a specific site

https://company.sharepoint.com/_layouts/15/sharepoint.aspx

Also in the news webpart you can filter the newssource to specific site or hub

Did you try image gallery and highlighted content webpart on modern pages

https://support.office.com/en-us/article/use-the-image-gallery-web-part-bbcbe560-14a7-4369-8ef5-3255845e3bfd

 Highlighted content webpart has a carousel layout.

Also there are some spfx webparts you could try

https://github.com/OlivierCC/spfx-40-fantastics/wiki/News-Carousel

https://blog.velingeorgiev.com/sharepoint-framework-slide-swiper

https://github.com/SharePoint/sp-dev-fx-webparts/tree/master/samples/jquery-photopile