Do you mean to win french league again? Mbappe has been signed for something bigger than it to win UCL. Losing mbappe as free agent is a big loss for PSG. You can remember that if PSG paid a lot of money for him.
It's not even worthy of PSG paid almost 1/5 from 1 billion to win only french league. The price that already got from winning french league was smaller compared with money used to buy mbappe.
Im thinking about PSG must try to make him leave from the club by selling it. It will help PSG so much to recover some funds used to bought him.
Are you kidding with PSG financial condition? they has much money and seems not problem losing Mbappe as free agent than sell him for next season. Regarding last contract Mbappe ever become free agent and he was success extended his contract until June 2024, I don't think with Mbappe last announcement he will not extend his contract when expiry on June 2024 because ever was broken his statement want to join with Real Madrid.
PSG still difficult for winning Champion League and make some star player frustrated keep stay with PSG, but I believe with excited offering from PSG for Mbappe seems can't denied and make him will stay for longer time there than joining with Real Madrid and has good chance winning Champion League.