The years are passing quickly, absolutely. But Mbappe knows that, he is aware that losing another season at PSG can cost him a lot in terms of his achievements as an individual player. I think it is already sad that he wasted a couple of years at PSG. It was entertaining in the beginning when it was Messi, Mbappe and Neymar, but retrospectively it didn't help him much except for becoming rich. But he would have become rich in any other club as well. Now he is in his mid 20s already and time is running. He could have broken dozens of records, but that is becoming more difficult now.
But it is becoming clearer every day that clubs will not want to sign the French attacker this season. Mbappe has made it clear that he doesn't intend to renew his contract with PSG, which means he will be a free agent at the end of this season. This will make him cheaper for clubs to sign him. Real Madrid was willing to get him this season but the financial implication plus his £893,000 weekly wage looks like a barrier.
There is not also any certainty that he would win trophies if he moves to Real Madrid or another English team that needs his service. PSG's new coach Luis Enrique shouldn't be underestimated, he is also making plans to make the club a force in Europe. He is targeting to bring in Joao Felix from Chelsea and Bernardo Silva from Manchester City.
At first, mbappe did not want to leave PSG, he has enjoyed a lot of privileges at PSG, and that has put the young man in a state of dilemma, and I feel now he has made his final decision since he does not want to renew his contract and have accepted to improve in his career and maybe win the balloon dor and been a free agent, PSG will not make good money out of him, paying mbappe this amount won't be easy since the guarantee of Madrid winning a trophy is not certain yet like you said the young man has potential in him aside his speed. the probability is still uncertain he has a better advantage if he goes to Madrid. there is a chance he might win a trophy for them.