How to create a giveaway and increase limit?

Support ticket...

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Your limit will increase with every succesful giveaway. For every three received games you will get an additional slot. So just wait for those you are running right now to finish and to be marked as received.

EDIT: So, yea didn't notice these three have been like a year ago ....

You're able to create up to 610 additional gifts based on your giveaway feedback.

I don't really have that problem sorry.. Wish I could share some of them with ya.
Deleted 4x giveaways though? (where you should be at with slots with 3 successful GAs & the initial 3x everyone gets)