There is nothing to regret because the interests of the team are greater than those of the individual. In fact, in my opinion, Mbappe is just a burden for anyone and it is difficult for any coach to determine his policies on the field. Now PSG must develop a clear road map to be able to compete domestically and in Europe. I think this transfer market must really be utilized well in order to get players who match the vision. I am sure that PSG remains a big club and they will always learn from their mistakes for the sake of a brighter future for the club.
PSG has tried very hard to keep Mbappe. But Mbappe has rejected every offer of a contract extension since last season. And PSG may indeed feel lost after Mbappe left, but the club has tried their best to keep Mbappe even though in the end they failed. And now they just have to focus on finding a suitable replacement. and in the transfer market there are still many names of strikers that PSG could still bring in to replace Mbappe. And it is reported that PSG is also quite interested in bringing in Osimhen but there has been no further news about this.
And reportedly there are several players who are expected to be suitable replacements for Mbappe, namely of course first Osimhen, then Luis Diaz and then PSG is also reportedly interested in approaching Bernardo Silva. But I feel that Osimhen is the closest to coming to PSG