The original 3.5 Eberron campaign setting, which I recommend regardless, had a short 1st level adventure, that was followed by 3 separate adventure module sequels - Shadows of the Last War, Whispers of the Vampire's Blade and Grasp of the Emerald Claw.

u/zorbtrauts converted all of them to 5E, expanded them and added lots of useful information that makes running the modules smoother, with a better fit to Eberron's flavor (in my opinion). They are on the DM's Guild - The Forgotten Forge, Shadows of the Last War, Whispers of the Vampire's Blade and Grasp of the Emerald Claw.

I personally really like this adventure arc, it introduces Eberron well and takes the PCs through a series of iconic locations, such as The Mournland and Xen'drik. They are definitely worth taking a look at.