question

http://www.steamgifts.com/create Read what it says in the top. After your current giveaways end and marked as received you will gain more giveaway slots. Make sure to pay a visit to the FAQ

only 1 giveaway completed => still 3 giveaway slot. 3 giveaway slots - 2 deleted giveaways = 1 giveaway slot.

you should be more careful while creating giveaways. you're eating up your slots by deleting them.

i lost all mine QQ