First, focus on the characters. Develop their personalities further, show their growth throughout the story. Second, create an interesting plot with twists and turns. For example, you could introduce a mystery related to the Genshin world. Third, use vivid descriptions to bring the world of Genshin to life, like describing the beautiful landscapes or the unique architecture.
The length of the Genshin story is hard to define precisely. It's constantly growing as the game developers introduce new quests, characters, and plotlines. But it's already quite substantial.
It really depends. Some Genshin story quests are relatively short and can be done in an hour or two. But complex ones could take five or more hours to finish, depending on your gameplay speed and how much you explore the details.
The Genshin Impact story is quite lengthy. There's a rich and detailed narrative that unfolds as you play. It could take dozens of hours to fully experience, especially if you take your time to enjoy all the side stories and lore.