For how long, though? It's not yet certain if he is even staying next season, let alone the season after that. Or how long he will be effective for that matter? Whoever we buy now will have to last quite some time while we spend money on other positions in the following transfer windows.
And I'm also having trouble seeing where Richarlison plays if Ronaldo is also playing? Sancho, and presumably Antony, are on the wings, with VdB/Bruno behind Ronaldo. He will have to contend with Ronaldo for CF. The same would have been true for Nunez, but between the two Nunez is a significantly better scorer.
I think we can do much better than that. Moussa Dembele and Osimhen in particular. For a non-insane fee of course. Lautaro Martinez is a long shot, but worth trying, despite his pretty horrific CL campaign this season.