You know what would've actually been interesting? If Lisbeth was the other reincarnator, was also trying to change things because she didn't like how the story turned out, and the issue becomes that they each want to change events but go about it differently.
But no, instead we get the typical reincarnated antagonist to these "I reincarnated as the villain" stories where the supposed hero of the story is turned into a vain, selfish, arrogant jerk who expects that everything has to go just right as it did in the story so they can have everything they want and that the "villain" trying to fix things doesn't deserve it.
Because why do something original when you can do exactly the same story as everyone else?