Make the most of this opportunity. In this instable political climate you have the upper hand.
As Malcolm IV is so young, take advantage of his naivety. Try to convince him to surrender lands to you, or else!
Your power is in your fleet not a land army. You would have difficulty penetrating the southern and eastern lands. David I was a clever monarch. He recognised the threat of rebellion on the frontiers and placed strategic Norman fortifications to defend his lands.
Which card will you play?