PSG must be looking for a new talent to recruit, and that talent must be able to play in a variety of positions as central attacker and winger, as Mbappe did. This will not be an easy task, but I am confident that many people are aware that the reason PSG is looking for a new talent is to replace Mbappe.
I've heard several possibilities about a replacement for Mbappé, in the past there was a lot of talk about Vini Júnior, and this will almost certainly happen even though Carlo Ancelotti considered Vini non-negotiable at the time.
Other names that have already been studied by PSG to replace Mbappé are: Rafael Leão, from Milan, Rashford, from Manchester United, and João Félix, from Atlético de Madrid, who is on loan at Chelsea.
Currently I would bet on Luis Díaz, from Liverpool, as a potential candidate and I'm sure that PSG has already included him in their list of possible signings.
I also have other names, less likely, but at this moment I prefer to wait for the market to "move" to guess more about it.