Look around Europe's big clubs, and you'll see a dearth of center-forwards. Real Madrid converted a left-winger to number nine last season (Kylian Mbappé). Arsenal used an attacking midfielder (Kai Havertz), until he got injured, and then another attacking midfielder (Mikel Merino). Paris Saint-Germain won the Champions League after turning a wide forward into a center-forward (Ousmane Dembélé).
Barcelona do have a central striker (Robert Lewandowski), but he turns 37 this summer. Liverpool have one too (Darwin Núñez), but he's usually on the bench, they're trying to get rid of him and, in any case, they often start with a wide forward (Luis Díaz) in that role.