PSG does not need to spend much to compete in the French league. But this team's only target was never the league, they always targeted UCL and they spent accordingly. Now they have removed Mbappe and sold him, they need to make transfers to fill his place, for this they need to make a lot of meetings, convince the players and managers, work extra hours and at the same time increase the offers for the players they want.
I really agree with you, indeed what PSG are targeting is not French league but champions league but unfortunately their dream as not come true after gathering top players but still it doesn't work out, now Mbappe his done and he was the face of PSG and now he went to Real Madrid, PSG will find it difficult to get Mbappe replacement because he was special to them in time of scoring goal, my worry is that can PSG get a replacement fast because the season is near, I know they will definitely do well even though Mbappé is not among them, they will only fill is absent in short term before they can get partial Mbappé.