The assessment has put your team in the very mature group. Our compliments! Since you've mastered the Lean UX principles, you know that you're never really done. So keep improving — but allow yourself a break, maybe.
Do you know someone who could profit from the book?
Go ahead and lend it to them. If they like it, maybe make some time to support their team in adopting the Lean UX way? Having them take the assessment is a good start to get the conversation going.
We don't have any more tips for you, really. So how about you give us some?