I think there is no denying that Real Madrid will definitely be much stronger with Kylian Mbappe. Mbappe and his friends will try to become the immortal team for the 16th UCL next year. I believe they will be successful because they have the best squad in the world right now. Maybe they will hire another right-back, but even this squad will be enough to complete next year in the best possible way.
agree with you, even with the composition of players that Real Madrid currently has, in my opinion it is more than enough to make them able to compete for next season in the Champions League. Moreover, with Mbappe joining the team, it makes them more complete in almost every position. Even though they will be left behind by several important players, such as Kroos, they are ready for that, because their regeneration is also going well.
However, that doesn't mean they will immediately get their 16th title, because they will also definitely have tough competition from other teams too, maybe there are also many teams that will be better prepared when they come into next season and provide something very difficult for Real Madrid. .