Apologies for the wrong lore or information. I don't play it, and I write it based on memories.
In which you, the player, are heavily associated with Celestia (friends? boss and secretary? etc.). You and the (bunch of gods in) Celestia have looked over this world forever. You are close, and you would bicker with them once in a while, but there are ranks between you and them.
With that being said, you know with certainty that Celestia has done many unforgivable things. No, you may be a part of them, but you refused to be one of them.
What you have seen in the game is worse, but not as bad as what Celestia came up with. Why doesn't it show? Well, that's because you interfere and reason with Celestia to tone down their ruthlessness.
Celestia is like the embodiment of a childish king who took the throne and thinks they can do anything, and you are like the minister who's trying to make the situation less worse.
The day you became a very responsible person is when the Archon war began. It was at this point where you realized you questioned why did you became friends with them.
For safety's sake and to improve the Celestia image (you failed this part hard), you didn't use any names but preferred to be seen and called as Celestia, as disgusting as it is.
When Khaenriah did something that absolutely got on Celestia's nerve, they began to plan the most horrible plan of all. That plan was to wipe out everything and restart. A failure, they said, and you, as the most reasonable of all, decided to smack some brain cells into them.
And thus, Khaenriah got destroyed, and the people turned into monsters and so on. Some few gods also lost their lives, and other troubling things began to pop up. But hey, you prevented the destruction of the entire world, and that's something.
The Electro Archon and her sibling would cease to exist, but you tweak the string of fate, and only one of them died. Sure, the nation will be a bit tense in the future because of the newly made Archon, but don't worry, you've got a plan for this, but that's for later.
The Geo Archon also lost someone just as planned otherwise. If both survived, something even more horrible would greet them if they stayed there, and you need certain people in certain areas to keep the plan in motion, so the God of Dust has to go.
Venti wasn't supposed to be an Anemo Archon, but he did because you planned it! if the rebels, the God of Storm and the God of North Wind keep doing that, everyone will be fcked. Game over. You placed the pieces carefully, and that's how Venti's background came to be.
Dendro Archon sacrificed herself to save her people from the forbidden knowledge that is spreading and same goes for her friends. This is the acceptable route because, in the beginning, Celestia wanted them to be straight up deceased with no disease. But you are very good at negotiating, and this is how it came to be.
For creating a new species of human, the Hydro Archon were prisoned, assumed control again and then died. She get replaced but that doesn't mean the new species of human would get spared from the sin. Celestia is just that sadistic and cruel. You were a bit late to the game, but you got a plan! You knew how to avert killing thousands of people. Unfortunately, at the cost of a certain new Archon's life. Again. Damn.
You have done so many things, all for the greater good. Celestia is despicable for wanting to destroy everything, but no doubt you are more despicable after all; you planned every tragedy just so Celestia don't act on their whim.
You could have stopped Celestia, but you are the smart one. You deduced that if you continue to disobey and disregard their orders and opinions, Celestia would have ditched you and destroyed everything. You love this world enough you couldn't bear to see it get destroyed.
Obviously, no one knows this. No one knows you planned the most intricate plan with the most complicated results, but when they do, it's mostly half true. No doubt that some had assumed you are the cause of the tragedy, which isn't wrong, but compared to the original order by Celestia, this is by far, less tragic.
What you failed to see is that the unknown god has dragged a certain pair of twins into this mess, and now you have to think even harder and smarter on how they are going to affect Teyvat and the future to come.
This is your previous life. Your recent life was a normal person and had a hobby for gaming. Your new life started when you woke up in Genshin Impact.
The new you doesn't know the past you, but you know the story unfolding before your eyes when you played the game as the traveler.
How does the story go when you begin your journey?
-
I know things don't line up, but then again, it's just an idea, and I'm tired.