Eulmore has a host of traders and merchants that are locked. This How To Unlock Eulmore Merchants In Final Fantasy XIV will tell you the mammoth task you must complete in order to unlock additional merchants in Eulmore, making a perfect hub for all your adventuring needs.
You reach Eulmore very early in the Shadowbringers story. When you first arrive you don’t even have permission to attune to the Aetheryte at first. After a long period in the Main Story Quest, you will eventually unlock the ability to attune there but the merchants are still locked.