Mbappe has been one of the deadliest strikers for the last two World Cups and he won one of them and finished the one in Qatar as vice world champion. I think calling that nothing serious is wrong.
I absolutely agree that he wasting golden years of his career with PSG because Ligue 1 is not where a player of his level is supposed to play. It was different for Messi because he had his success already and some circumstances led him to play for PSG. But it is not like Mbappe should be blamed for not winning the Champions League. He has proven that he can deliver on the highest levels with 12 goals in two World Cups. I can only hope that he will soon make a decision to leave PSG and finally play in a better league, but here is really only the Premier League that would get the best out of him and maybe La Liga if Barcelona gets back to strength and perhaps Atletico Madrid as well.
Barcelona, Atletico, but not Real?! Did I miss something or did you just forget about Real Madrid, with which negotiations have been going on for a long time and most people assume that Mbappe will move to Real Madrid next summer?
A move to the Premier League, I think, is extremely unlikely since he won’t go to City because of Haaland, and there is no point in moving to another club where the likelihood of a Premier League title will be low.
If you give my post a second read, you will see that I did not mention Real Madrid as a team that needs to get back to full strength because I think at the moment they are already the best team in La Liga

What I meant to say is that if Barcelona and Atletico finally get back to good old times, La Liga will also have an intense title fight.
A move to the Premier League is something I would enjoy the most because no matter what character he is, watching him play is usually impressive. He really has not many games without any actions on his part that are world class. I agree that Manchester City is unlikely although I think it could still work with him playing on the left wing and Haaland in the center. But maybe Salah will be bought from an SPL club and Liverpool uses the money to buy Mbappe?

That would also be amazing, but I admit this is only a little bit of dreaming. Most likely, if anything he will go to Real Madrid.