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You can try to contact support but i'm not sure when they will answer
i have a report because one of my giveaways was not activated, both the giveaway and report are a year old already

i'm not much into the second idea, unless if you did all giveaways from bundles it would take you a lot of time to find a cheap game, buy all the copies and you would only get CV for the first 10 copies

If I'm right, support can only add 3 slots, and only the admin can give you more slots than that, so it takes more time.

You can ask for additional slots and specify why you want more. If you don't specify, they will ask. They give additional slots... I got 3. But I'm not sure if they will give you much more than that. :)