If Lewandowski continues to score just as little, then it is very likely that some "regular" striker from the average team will be able to get around him. 23 goals is not at all the level in modern realities, not only for La Liga, but even for the Premier League, where Kane scores 30 goals in a season and he is still not in first place (because of Haaland).
Considering his age that is not young anymore, 23 goals is a good achievement at least. But you are right, if he can only score 23 more or less yes there is a possibility other strikers can handle it. By the way, at the moment I haven't seen any good move at the Barcelona club, in my opinion they should release of their players two or three players. Because previously their funds from the advantage transfer of Antoine Griezmann and Trincão, maybe already used to sign Vitor Roque, also to improve their finances little by little Barcelona must be ready to sell their players again.
Scoring 23 goals in his first season with Barcelona is a good achievement for Lewandowski, especially at his no longer young age. Lewandowski has contributed greatly to Barcelona success last season, he immediately adapted very well to the tactics used by Xavi.
Barcelona needs to streamline its squad to make room for new players. Vitor Roque is one of Barcelona good purchases this season, he is young and talented, his presence has really helped Barcelona improve their quality. Selling several players needs to be done to reduce their salary burden, apart from that Barcelona will receive income that can be used to bring in new players, recently Barcelona has also begun to be linked with Bernardo Silva.