The way Al Nassr lost, was a humiliating one after spending that much on players. They were clearly the better team, and yet they still failed to win. That is the problem they have, even when they are the better team, they lose, and they can't afford to do that much. Ronaldo lost the chance to get one more cup, and it is really not looking good, been years since he got one, they got one on his first year and nothing after that.
Al -Nassr is a strong team but they still failed to score and brought a new cup. I think this is the reason if you think you are strong then being strong is not enough. The process of learning and being more better should never be stopped. Because the chances of being better always depends on the potential of the one who wants to be go on the side of perfection. The Al-Nassr needs to emphasis on their defense line because this is the thing which truly leads them towards betterment. Because the presence of the most experienced and talented player Cristiano Ronaldo was not worked in the favour of the team. So I think the team has no such issues to bringing some new players to make their defense system more strong.