PSG must build a solid foundation if they have the ambition to appear consistently in every competition, it is not an obstacle to winning the Champions League even though they come from Ligue 1. PSG should be able to change their transfer culture which is too ambitious with star players, PSG must start by providing stage for young players. Dedication and loyalty will not be achieved by just giving high salaries to players, PSG must ensure that every player is happy at the club, that way they will give everything to the team. There are no instant results that can be obtained by relying on star players alone, all players in the squad should be treated special by the club. In my opinion, if PSG can change all that, they will succeed in realizing their ambition of winning the Champions League in the future.
Of cousre PSG must be able to build a solid foundation to be able to continue their desire to win the Champions League trophy so far, but without tight competition in the league, it will not make them have a strong enough mentality to support their performance, so far PSG has done so there are many things to be able to get their first trophy in the Champions League, including bringing in star players, but it turns out that this doesn't actually guarantee that they can win the Champions League so far, although PSG Is starting to be considered one of the strongest competing teams in the Champions League so far, but to be able to win the champions league, of course squad depth and player quality alone are not enough without a strong mentality.
PSG has failed with its star players, hoping for a competitive league also seems impossible happen in Ligue 1 in order to improve their mentality, so I think what you say might be the right solution for PSG now, it seems like it's time for PSG to start changing their current mindset of continuing to rely on star players and of course building a young squad may be more likely to give them hope of becoming Champions League champions in the future.