Need p6 advice

I finally have worked my way up to be able to p6 one of my favorite characters only been playing a few months, I usually roll with Luther/giant g, I can take either one up to p6 I’m thinking giant g,

My question is what intensive skills should I boost when I make the upgrade, I’d like to pull more boards down and get more blocks, but when I run into a high level big I sometimes have trouble scoring on them too. So what would be the best things to upgrade for giant g