My value didn't change

Support won't do anything, once a game is a bundle game it doesn't matter whether you give a key or a gift.

If you've given away enough bundle games, then it's an easy formula.

($25 + non bundle games) * 1.2 = Contribution value

Your first $25 in bundle games counts for full value, then you need non bundle games in order to increase it. If you have any excess bundle game value, you'll receive it at a rate of 20% of your non bundle contributions + the initial $25.