I'd have chosen the following team:
Courtois (Belgium); Vrsaljko (Croatia), Varane (France), Maguire (England), Marcelo (Brazil); Pogba (France), Modric (Croatia), Coutinho (Brazil); Mbappé (France), Ronaldo (Portugal), Hazard (Belgium).
To me Brazil was the best footballing team this tournament. Especially their left side was very good, that's why I included Marcelo en Coutinho in the team. England reached the semis due to their dominance in the air, in particular Maguire, although not flashy that deserves a spot. It was a close call between Meunier and Vrsaljko.
De Bruyne had some great moments, but he wasn't a big factor on the pitch against the top teams (Brazil (2nd half), France and England). That's why he doesn't make the cut. Ronaldo might be a surprising pick, but to me he was the best player in the group stage and that's why I gave him the edge despite only playing 4 matches. Neither striker of the semi finalists impressed me.