Lewandowski's improved performance this season is indeed inseparable from the support of other players so that Lewandowski on the front line gets enough support for him to score goals, and indeed Lewandowski's performance is quite good but since he came to Barcelona he has not received strong support from his colleagues and only this season Lewandowski really got it so that he showed his sharpness again.
As an old player, Lewandowski now has less ability to carry a whole team to wining by himself. Now at his old age, he needs more support from his teammates but if he receives enough support and key passes, he will score many goals for his team. Using Lewandowski now and in next several seasons is like double-edged sword and soon we will discuss about Lewandowski like what we talked about Cristiano Ronaldo 3 seasons ago in Manchester United. Like an old striker scored a lot of goals but his team failed, and didn't win any title. This is natural with any old player who will need to be used properly, wisely and other players in a squad have to work harder to cover weakness of that old player.
For other Barcelona players this season is indeed very potential, some of their young players continue to show impressive performances and that shows that the future of Barcelona players will be quite positive, and what they have shown this season is a big surprise even though it was doubted at the beginning of the season.
It can be one of key reasons to help Lewandowski is playing better in this season. More young teammates, more energy and Lewandowski has more space created by his teammates when they attract defenders with their dribbles, movements and so on.