On top of upgrading your characters the Starconch are often used in Genshin Impact, while not that hard to find you'll still need a lot of them so here's a guide to where you can get your hands on a bunch.
Starconch Location in genshin Impact
The Starconch can be found in Liyue and close to the Dragonspine
If you're looking for a more precise location for all these Starconch I'd advice checking the official interactive map where you'll be able to zoon as you see fit.
You can find the map on the Hoyolab website here.
