If the UCL had been won with Vlahovic or Osimhen, Juventus or Napoli should have won this cup last year. A player and a team do not change from start to finish. Even Messi couldn't make PSG the Champions League champion. So it's not tied to one player. As you said, Luis Enrique needs to make PSG stand out as a team. If he can achieve this, PSG may have a chance.
PSG president, Nasser Al-Khelaifi have the authority to make things right for the club, he's taking crucial actions to upgrade the team. PSG coach, Luis Enrique have the potentials to bring the team back to stand. UCL is a difficult trophy to win, it's clear how these elite clubs win the trophy. PSG are not fit to withstand there elite opponents, rather they should be keen on winning the usual titles. PSG winning the UEFA Champions League is weigh out of the picture because the Parisians are yet to discover their purpose, the team having challenges when it comes to elite competition.