Yes, in Genshin Impact, you can replay certain parts of the story. For example, you can revisit cutscenes in the in - game archive. This allows you to relive the important story moments and catch details you might have missed the first time.
Generally, no. Story quests in Genshin are designed to be completed in sequence and cannot be canceled mid-way. This is to maintain the integrity and flow of the game's narrative.
As of now, the Genshin manga is not finished. The story is still evolving and there's more to come for fans to enjoy. The creators are taking their time to develop a rich and engaging narrative.
There's no definite answer yet. It might continue if there's enough demand and the creative team has more story to tell. But it could also stop if they feel they've completed the story arc.