IMO, to really promote the giveaway front page, we sort of need to give it a bit more hype.

Something like a countdown timer to the GA of an over-hyped pre-order game.
Then below it, have something that says "Check out the current GAs while you wait".
Make the attraction GA very short, like 48hrs only.
Once the attraction GA is over, you can promote it by saying "oh noes! you JUST missed out on <big title> ..be sure to check this page more regularly for more over marketed game giveaways."

Of course, this exercise will be expensive. Freaking $60 for a new game these days
...Maybe MyGaming can subsidize some of the cost

On entering GAs... my library is getting a wee bit bloated - I enter GAs very selectively.