I have a bold prediction that Napoli next season won't even be in Top 4. I expect them to lose a lot of points in begining of the season. Everyone will play with more fire against them since they are champions and with possible departures of key players I see that happening.
I'm not a fan of Napoli as I read that their coach manager resigned and also some of their players were sold to other clubs and out of contract, but I can't predict the future because we don't know in the future Napoli will buy other great players or not. next season, juventus, their competitor, was hampered because of a case that made them play inconsistently so that they fell to 7th place.
I am also sure that the completion of the case facing Juventus will make them pay for their failures this season so that next season they may also have new players to make Juventus rise from adversity.
Because Napoli have been able to consistently compete in the top four in previous seasons, so next season I personally will remain confident that Napoli will still be a team competing in the top four. Although indeed, it seems certain that in the next season Napoli will have a new coach and also, with key players who will leave the club, but I believe this will not make Napoli so weak that it cannot compete in the top four.
I think Napoli chances of being in top4 next season lies in their hands because before winning the league this season they have been competing in the champions league and they have also been very strong in their local league despite not being able to win it but right now things will definitely change if they decide to sell most of the stars in in the team that gave them the trophy, will they be able to replace them with better players now thwt they will be under a new coach? Same thing happened in the English Premier League with the Leicester City team after winning the league they sold some players but they were not able to get better replacement and now they have been relegated but I hope Napoli don't become too weak after accepting big money from the sells of the stars in the team because obviously they are going to have crazy offers from clubs and they will likely sell at least three major players to get big money.