In my opinion if napoli shall have signed a coach that has ever won UCL. It will make napoli able to know the way to win UCL. Napoli has bigger target since it has been winning scudetto.
Osimhen is now targeting UCL trophy as the main target. It's caused by UCL is the most valuable trophy to be won.
The coach on a team is like a spear sharpener so that if the coach can fix all the shortcomings of the team then the team will become a team to be feared.
If Napoli has a coach who has experience winning the UCL more than 1 time, then it is possible that Napoli can also win the UCL, but they still have to be supported by reliable players so that the coach's hard work to improve a team is not.
In the last 2 seasons Napoli have played quite well and some of their players have had a number of proud achievements so if in the future they can develop even better then there is a high probability that there will be a chance to win the UCL.