Chelsea is still working in progress so Chelsea should concentrate on getting a formidable team can can be consistent just as you have said Chelsea biggest problem is the way and manner that they change coaches and this has affected their style of play, it will take Chelsea two to three years before they can get back to competing for a major title race
Chelsea's problem isn't just with the manager; some of their players also have weaknesses, so Chelsea must address these if they want to challenge for the Premier League title next season. However, in the near future, Chelsea must focus on winning the Club World Cup, as the opponents they face are quite formidable. Chelsea will need to significantly improve their strengths for the final. Therefore, the current manager must prioritize this, as it is a crucial final for them to win before they can enter the Premier League next season.