Maybe Rudi Garcia will do better than Spalletti. However, time must be given for this. It is highly unlikely that Rudi Garcia will do something extraordinary next season and Napoli will win the title again. Because Rudi Garcia is not yet familiar with this team. And more importantly, several of Napoli's star players have left the team. The effect can certainly be seen in Napoli's performance. The likelihood of consistently good performances from Napoli next season is slim. Juventus or Inter Milan will probably dominate Serie A next season.
Last season, Napoli managed to show their strength in matches in the Serie A League and were in first place at the top of the standings. At least Spalletti has very good experience at Napoli, while Rugi Garcia is still relatively new, and I doubt whether Napoli will dominate the Serie A next season or not.Usually, a change of coach becomes one of the triggers for winning or losing and becomes part of the journey of a soccer club.