Mbappe and Ronaldo are once in a generation type talents, or at least potentially in the case of the former. It would be great to be able to nab someone of that profile but more realistically it would be fine to sign the players who fall a level below that and most of those guys are attainable. I think what would attract young players who fit that bracket is seeing someone like Guendouzi go straight into the starting XI, rather than go to a club like Madrid, PSG, United or City and spend time on the bench or out on loan. Having a rep for developing young talent and turning them into starts counts for a lot.