Even long before now Real Madrid team wasn't finding it difficult to win most matches especially in the Spanish La Liga games and now that Mbappe has been brought into the team, it will help to even make the team get more better that's if he's arrival won't affect the positive growth of the team since he's a player that likes to been seen as the best and the head speaking from his experience with his other team mates in PSG. The Madrid coach will surely blend Mbappe to become a better top 9 and the presence of Jude Bellingham, Rodrigo and Vinicius junior alone will help Mbappe to score goals with ease because the above names are good runners and also finishers who will likely work with Mbappe to ensure they get a better result and win trophies for the team.
In La Liga Real Madrid is still one of the best clubs even though it is not strengthened by Mbappe.
Mbappe's presence actually adds strength to the attack line and will make Real Madrid stronger than before.
One thing that is difficult is how Ancelotti must be able to defend the Champions League title because in La Liga I don't think it is that difficult. Real Madrid has players who have speed in running, but this strategy cannot necessarily be implemented because each match definitely has a different strategy.
It will be much easier for Mbappe to score goals if other players can provide good passes, just like when he plays for the national team, where in the past there was Pogba who always sent beautiful passes for him to score goals.