Why do you say that Mbappe is selfish?
Even if you can see Mbappe's achievements, who always gave a very strong performance in every match and brought Paris SG to the top of league 1 this season.
It's not that Paris SG's failure in the champion's league was the cause of Mbappe, but indeed Paris SG is not strong enough to compete with other clubs in the champion's league.
But I agree that Paris SG must immediately look for new players who are superior to be able to welcome the champions league.
Yes it's true, there is no point in blaming Mbappe because PSG failed to win the UCL because of their selfishness. In my opinion, PSG must find the right coach to manage PSG and their star players. We know that PSG owners are very ambitious to win the UCL league trophy. That is clearly their main target, PSG.
However, the step taken by PSG by bringing in top and experienced players in the UCL, such as Ramos, Messi, Donnaruma and coupled with Neymar, Mbappe plus the other best PSG squad, is actually not the best and quick solution. Nothing is instant and fast, let alone to dominate Europe in the UCL event. Everything takes a long process, Real Madrid and the Los Galacticos squad themselves took a long time to become UCL champions. But now that these star players have left PSG, it's time for PSG to look for new players and make a solid team for next season.