Let me cite the rules for you:

Gifts you win must be activated on the Steam account you used to register. Do not regift, trade, or sell the gifts. After activating a gift on your Steam account, do not remove the game or set it to private, as we may need to verify the activation if your account is reviewed in the future.

You should hide giveaways for the game by clicking on the eye icon on the giveaway page or once of the giveaway listing pages.