I agree with you for Barcelona to replace some of their strikers next season, because their strikers didn't perform very well in this season despite they are in the second position, and if their coach can start searching for potential strikers to use to replace Barcelona strikers, I think it will improve their performance next season. I think, Robert Lewandowskii is getting older in this football career which their coach need to include him among the strikes that will going to be replace in their next season, so that they will have a solid strikers that can handle the front to help the team to always achieve goals. Based on the position Real Madrid are in this season, I don't think they will miss this this la Liga league title because they are leading other teams with high points, which it will be difficult for any team to recover and top Real Madrid.
Lewandowski is used to the fact that in Bayern all the conditions were created for him to score, but in Barcelona everything is different, he himself has to work very hard for this, so it is clear that his performance has become worse. Xavi is well aware that he needs to strengthen his attack, and he has also already spoken about the fact that they may have to sell Lewandowski. I expect a significant increase in attack from Barcelona this off-season. Xavi understands that the upcoming season will be very difficult, but they at least have to compete with Real.