Next season Roma will clearly have several different players. And I actually hope Roma buy Lukaku from Chelsea. but it looks like Roma is not in a condition that can bring Lukaku back to Rome. And currently Lukaku is being fought over by AC Milan and Napoli. And yes, this will make Lukaku return to Serie A. And that is quite unique because every season Lukaku returns to Serie A and plays for a different club.
Sometimes what makes a player more active in performance is mostly the kind of leagues they find themselves because with the performance of some of the players that change there current leagues to other is quite impressive, however I could remember Haaland that move from Bundesliga he was playing and joined Manchester City and all of a sudden he became one of the most important player on the club, so I believe there is also a good chance changing league will help Lukaku on his career so I believe he will certain play well on this Italian league, though between Roma, AC Milan and Napoli I think for now AC Milan will be a good choice for Lukaku because the club is currently doing well so perhaps the chances of Lukaku improving a lot will be very high.