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[Witcher 3] How did Geralt get so powerful between The Lesser Evil and the Witcher games? [Mild Witcher book spoilers]

Witcher 3: how did Geralt get so powerful between The Lesser Evil and the Witcher games? [Mild Witcher book spoilers]

In The Lesser Evil, Geralt's actions earned him a title that’s stuck with him through every game: The Butcher of Blaviken. It’s a good story, and really highlights the ethically grey areas Geralt finds himself in, as well as showing off how badass he can be with a sword.

There’s only one problem: Geralt "only" killed like five or six people at once, compared to the literal dozens that he kills without effort in the Witcher games. If killing six goons in a market square was enough to warrant such a grim title, how come nobody makes much fuss of his more recent killing sprees?

It’s true that some of the bigger death tolls happen in bandit camps in the wild or enclosed spaces away from public eyes, but he’s also killed groups of thieves and bandits in Novigrad with plenty of witnesses.
gpt
He didn't get the title just because he killed 6 people, it's because the town believes he did it unprovoked. They had no idea the what the people he killed were planning, they just saw him in the market sword in hand ready to kill. To the towns people he just butchered the people because he's a mutant witcher. Nature and publicity of the kills stuck him with the title, kinda like how Jake the ripper is one of the most infamous serial killers although he only killed 5 or 6 women, compared to the dozens another might have.