More games. That's a fact.
And against more types of armies too.
There's so many armies that I have not faced yet. Tyranids, Tau, Necrons, various SM chapters. Another IG.
I've been facing off against SM/SW/BA, Eldar and Chaos. And it's been fun. But I think I need to test my lists in different situations against more armies. To have a feel of pain they can dish out and how I can handle them.