I do not see many strategies that PSG implemented to be able to win the Champions League apart from signing 3 supers stars in the same club and giving one an over priced contract thereby setting the whole team in disarray.
Nothing new came from PSG. Even its new players performed even worst. The draw against al nassr is a proof if PSG is not having special preparation for upcoming season. The new era under enrique will not be as good as when PSG had messi in the club.
The play style has been changing a lot. That's the main reason why messi was a crucial for PSG. There's nothing new from this club, mbappe will not be playing next season as he may be fully benched by the club. It's not impossible for osimhen to recruit another expensive player and repeat the same mistake.
If PSG really want to be prepared for the Champions League challenge they should also look at quality defence and midfield.
The problem if psg doesn't have good attacking line too. Neymar?Mbappe? these guys could do nothing in UCL. They played so well in the domestic league, but it will be so difficult to beat another team in UCL. PSG needs to reforming its attacking line again.
The last season has proven if PSG's attacking line was not even effective. That's the main reason why PSG needs to sell mbappe. The club can raise money and put it into the new players again.
300 millions are a lot of money for the club. that's why PSG accept it. You will never ever see a team paid 300 millions for a player with one season of contract duration.