Even though he is quite old, Lewandowski is still very fit to play with Barcelona next season. Even though Lewandowski's goal productivity has decreased this season, I also don't consider this a decline. Because it cannot be denied that the competition in Laliga this season is much more difficult than last season. For example, Girona suddenly appeared in table 3 of the LaLiga standings and several other teams also experienced a very significant increase in performance. Therefore, it is natural that Lewandowski will have more difficulty scoring as many goals as the previous season. The reason is that the La Liga competition this season is indeed fiercer.
Apart from that, for next season, I don't think Barcelona needs to bring in new players. Because actually, currently Barcelona already has players who have quite good abilities and skills. So in essence, Xavi just needs to organize and match the players that Barcelona currently has in order to achieve pretty good results. Because in my opinion the problem Barcelona is currently experiencing is that their players have not found the right position. So with the limited costs that Barcelona is currently experiencing, I think this is a pretty good way to make Barcelona perform better next season.
Because if, for example, Barcelona sells several of its players next season, in my opinion that is also too risky. Because, the risk is that Barcelona will not necessarily get better players than the current players. So in my opinion, utilizing existing players is a way out of the problems Barcelona is currently experiencing.
Lewandowski is a great striker. He's still got the fuel in him to net in more goals. He's agile, skilful and his goal scoring abilities are at the peak. Although age is calling gradually but he's still got a bit of time in him to show his worth in the public and projected games too. Although like Ronaldo, even at the age he is, he still kept the zeal on. I don't think Lewandowski's case would be any different.
Let him still use the ample of his time left to do exploits. He's got European cups and tournaments to journey through and in him, there's all that it'd take. Age is still favourable to him and he doesn't look like he'd slack in a few years to come, so for the mean time, he's got to enjoy his playing time before thinking of retiring back to the Arab league or quit football generally.
The striker can still be a useful asset to the Spanish side. Despite the ups and downs, he's managed to stay in form and shape, he still does well to net in goals when he's got the chance to and so far his rate of play isn't really any need for alarm. The club themselves know how advantageous he is and also how difficult it is to get an active striker in the market now. So they've just got to stick to appropriate terms with him and also try to work with him as he strives to do his best in being relevant in the team too.