10,000 Ships references the voyage of the warrior Princess Nymeria who lived a thousand years before Game of Thrones and after whom Arya Stark named her direwolf.
Nymeria travelled from Essos to Dorne, so a show centered on her would presumably explore parts of the Game of Thrones universe that haven’t gotten much attention compared to Westeros.
The other two new potential spinoffs reportedly have no writers attached at this point.
I’m not saying that the Game of Thrones franchise will become the next MCU or One Chicago or even Arrowverse, but the wider the universe gets, the more openings there will be for characters from different shows sharing the same screen.