no one knows what the future holds but what is clear is that Lukaku is a player who already has talent and it has been seen by football fans that he is a player who has talent and can be developed if he is coached by a suitable coach. Even if he has to stay in Serie A, that might be his decision but as I said, every player should have a change where they have to be willing to step up to become the best but it all comes back to them being the one who has the decision.
Lukaku, who can really perform well when he is on the field shows that he is a player who really has talent and of course there will be coaches who are interested in recruiting him, like Antonio Conte, who is interested in Lukaku, he should be able to nurture Lukaku well and make him a star player but Antonio Conte's quality could also influence Lukaku in the future.
What you say is quite true if we saw him play several seasons ago, but we have to admit that currently Lukaku has experienced a significant decline in performance due to his age which has increased, but even so, as a striker who has Previously successful, of course Lukaku still has quite good abilities in scoring goals and breaking down every opponent defense, but currently the difficult conditions that occur with Lukaku contract situation of course make him have a dilemma in continuing his career, Lukaku still has a contract with Chelsea but Chelsea no longer wants to take him into the main squad at this time, apart from that, Chelsea also don't want to lower the selling price for Lukaku, which is currently in demand by several clubs.
Napoli currently really want Lukaku as one of their transfer targets which they want to realize in the near future, but reportedly Chelsea also don't want to let go of Lukaku at a cheap price at the moment,In the last few seasons, Lukaku has appeared quite impressive with Italian clubs so it seems like He is able to adapt well in Serie A compared to the English league and that is why Conte might make him Napoli main striker next season.