Barcelona spent the end of the season very well, so now it’s not worth saying that they are in decline, especially since they have a new coach and this often gives the team a good boost. I don’t think that Mbappe is capable of somehow improving Real’s attack, especially in the form he is in now. He will have to work well with Ancelotti to improve his condition, only after that it will be possible to talk about whether he can give something to Real Madrid or not.
Regarding the quality of the squad, Barcelona is currently no worthy of being said to be experiencing setbacks. Because we need to know that Barcelona has players who have experienced a very significant increase in performance at this time. For example, Lamine Yamal, Pedri, Ferran Torres, and also Fermin Lopez. These four players can be very sharp spearheads for Barcelona next season. So for now Barcelona cannot be underestimated if you look at the depth of the squad they currently have. That's why, next season it is certain that Barcelona will still be a strong competitor to Real Madrid.
However, if we talk from a financial perspective, it is clear that Barcelona currently has a few problems. This is certainly news that is familiar to our ears, because Barcelona has been experiencing financial difficulties for quite some time.
And regarding Real Madrid, of course next season they also have to work very hard. Even though Real Madrid currently has Mbappe in its squad, this cannot yet be a benchmark that Real Madrid will be strong next season. Because as you said, Mbappe definitely needs adaptation and also needs chemistry with the coach or with other Real Madrid players to be able to maximize his performance. So it is certain that at the start of next season Mbappe will definitely not immediately play as well as he did at PSG. Therefore, if we compare Real Madrid and Barcelona today, there may not be much difference in terms of player quality, but if we only talk about financial matters, Real Madrid is clearly far superior to Barcelona.
So for next season, Real Madrid and Barcelona will remain equal rivals. Moreover, as you said, currently Barcelona has had a new coach (Hansi Flick) and from the news circulating Barcelona is rumored to be making a contract offer to Nico William. And if Nico William is successfully brought in by Barcelona, it is clear that Barcelona's front line will be very scary next season. Because we definitely know that Lamine Yamal will be a very suitable teammate for Nico. Because it was proven that at the Euros they were very compact in Spain's attack line.