If you're looking to reset skill points in Witcher 3, you'll need to obtain a special item called the Potion of Clearance.
This potion allows you to respec your character, giving you the opportunity to redistribute your ability points as you see fit. You can find the Potion of Clearance from various merchants, with the easiest option being an unnamed merchant in Gildorf, Novigrad, who sells it for 1,000 crowns without any quest requirements.
Alternatively, you can also purchase the potion from characters like Keira Metz, Gremist, and Yolar, but some may require you to complete specific quests first. If you're starting a New Game+, you'll receive a Potion of Clearance automatically, allowing you to reset your skills right from the beginning.
Remember, the potion can only be consumed once, so use it wisely to optimize Geralt's build for your playstyle.
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