It is clear cut for me. Save for a Dembele masterclass final, it's Lamine Yamal. Kid is probably going to light it up again in Nations League semis vs the Frenchies.
No other player in the world can take 2-3 opponents, drop them, and score a worldie like Yamal does. Didn't think he'd do it this yearly, but he reached best player in the world level already. It's easier for him also considering that there is a void of such players around.
He had to prove it vs the best sides to reach this level, and he did despite the very young age. Dortmund, Atletico, Inter, Madrid, Benfica... these are all top 10-15 sides, some even top 8.