There are many factors that play a role in bringing a team to become a champion, but financial strength plays a big role among all the other factors. Some clubs that have star players in the team, sometimes have to let them go, because the club financial condition requires them to do so. This cycle often happens, and Mbappe transfer from AS Monaco to PSG is one example.
With financial strength, PSG can also cut down the time to build an ideal team, PSG is also able to unite them all in one transfer window. That is what makes the competition in Ligue 1 never balanced, but this season, I see a slight improvement. Marseille and AS Monaco have at least made the competition in the Champions League zone even fiercer than the previous season.
Now finances are key for success any club because having quality players must without them no club can go through for top spots in any league while in France we have after good investment Marseille and Monaco improving their performance which helping them for challenging PSG.
After this clubs needed good depth in players which is only possible if they have good coach without this it's also not possible to win trophies while playing together give them good chance of understanding and having experience. PSG have no good depth and good experience which always creates problems, but now things are taking changes and management keeping faith in Luis Enrique who is doing things which will help them in long run for success