We will see developments regarding the status of his contract at PSG, if he extends it then he will stay here but if there is no extension then he will move and Real Madrid will be the main destination, but many things could happen because he could change his mind.
Mbappe is always full of controversy and surprises. we will not know whether, at the end of his soon-to-expire contract, he will extend it or not. but PSG must be prepared because those left by Mbappe could really affect the team's strength.
On the other hand, Mbappe will not be easy to get a new club. many want it, especially with free transfer status.
But we cannot immediately say this for sure because there could be other scenarios that occur when Mbappe leaves even though Madrid can be at the forefront at this time but if you are too sure this will also cause disappointment if Madrid cannot bring Mbappe like 2 seasons ago.
but if PG really doesn't get Mbappe's signature, I'm sure Madrid is Mbappe's main choice. although there will be interference from other clubs in Europe. I still believe Madrid will get it. Unless Madrid closes down their desire to get Mbappe, that opens up opportunities for other clubs to negotiate.