You are being a bit too optimistic about Real's chances for the new season. With the way they played against PSG, they might not even reach the final. Because with that kind of defense, you cannot expect good results. Although on the other hand, their main defenders might still find their form and everything could change. But for now, I do not see any big improvements in Real's defense. Of course, they will always set the highest goals for themselves to reach the Champions League final and even win it, but for that they need to strengthen their defense. And actually, PSG did not manage to score a single goal despite such a strong attack, so that is also something to pay attention to.
Even if Real Madrid fails to win anything, the "aim" is to win everything, because how could Real Madrid start a season thinking they won't win la liga and ucl? That is not how Real Madrid works, they think of trying to win everything, even if they fail the goal should always be that.
However, that also means they need to have depth, and they need to stay healthy, last year we have seen them not be healthy and we saw what that meant, when you have more than one player injured, it causes the team to be not good enough. So what they need right now is health and depth. If they get enough players to be good enough at la liga, in some games they can rest the star players and play the bench players and still win games, that way they can rest some of their players.