Thanks for your help. I've submitted another ticket to request the new winner. I hope the supports from SteamGifts can help.

Hi ViolentSpray, I just got the reply from SteamGifts

This giveaway is for two copies of the DLC and there were only two winners. We simply cannot reroll it as there are no other winners available. The only option here would be to delete your entry in the giveaway, and in order to do that we will need a ticket from the creator and your agreement to the deletion, which you can leave in the giveaway comments.

I request to delete my entry in the giveaway and could you please help create a ticket for the deletion?

Got it. Then I will keep the giveaway not marked(received or not received). Otherwise I may get banned. Sorry for the trouble.