I was to giveaway a game, but find out that the game is 0P, any chance to fix?

I'm unsure, but if a game is not in a list, you can request support to add it. So assuming your trying to giveaway a gift of STIENS;GATE ELITE, which I assume means your giving "STEINS;GATE ELITE - Bonus Content Bundle", you should ask support to add that to the list.

Theres no fixing 0P (0 CV or ** marked games) that I know of.
Sounds like you may want to go into your GA and delete it? Or accept the 0 CV?

As the game had a price once, you can create a support ticket and ask them to set the price to the last recorded one, as far as I know.

do not giveaways to gain cv from it... it wont pay off. so just create giveaways for games you have keys left you dont need or if you have enought money and want to make a stranger happy/ have the feeling to do something nice)
but if you want something in return (like cv to increase the chance in winning something): you should rather trade on some trading sites. this would make less work and you would gain much more for your games.

Hi AShine0720, STEINS;GATE ELITE has been updated to 60P and a value of $59.99. As for bundles, we don't currently support the option to give them away.