Lewandowski has been motivated to tries to add his trophy collection to his library, Uefa Europa league is one he doesn't have which I think is a big desire to create many goals to Barcelona. But, the age factor is one condition he must think if want to continue in europa competition because there is a opponent that has golden age player who can be as competitor. Barca also have the attacker who can replace him any time if can give a contribution like Dembele, Raphinha, Depay and Torres.
Competition between young players can sometimes make Lewandowski even sharper in front of goal, I think he will continue to play to fill Barcelona's starters even though he is no longer young but Lewandowski's instinct for scoring goals cannot be doubted. It is likely that Lewandowski is a strong candidate for the top scorer in the European league this time, but he will need to beat Vitor Oliviera's record of 4 goals in order to win the award. However, if there are other options if Lewandowski is unsatisfactory then the choice I think is the most suitable is Memphis Depay, although he is rarely played but he is still good enough as a striker.