 If you liked
Omniscient Reader's Viewpoint
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 ...then you might like
The Perks of Being an S-Class Heroine
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These two manhwas share a similar style, where "gods" interact with the MC using messages. Also the MC is somehow aware of the story of the book they are in and they try to change parts of the story. Lastly, the original MCs of the stories they are in returned in time multiple times until it changed them.