I have no doubt that Lewandowski is a fantastic player. I saw Lewandowski's performance in the Bayern Munich team. A great player and he is able to score regularly. Lewandowski did not play well in the Poland team. Because the Poland team is not strong enough. It is very difficult for any player to score without the help of midfielders. Poland's midfield was not strong enough. This is why we don't see Lewandowski perform as expected. However, Barcelona's midfield is strong enough. And so I think Lewandowski's performance will be stronger in the upcoming matches with Barcelona. And he will be able to score consistently.
Even taking into account the fact that the Polish national team is far from the top teams, Levadowski has excellent statistics when playing for the national team - in 134 games he scored 76 goals. Many great players can only dream of such statistics. But the national team is not a club that can be changed, so the players are to some extent in a cage and cannot change the "fate" that determined them to be a weak team. For example, Haaland's situation is even worse - if he gets into the final part of the European Championship or the World Cup, then this will already be a huge achievement.