I must say that you just expressed my mind here, most times, it's not the changing of the coach that matters in clubs but finding a way to increase the psychological issue. Forget about the fact that many of those players playing for Chelsea have good profiles, they could be demoralised as well and have lack of true will, the club needs to get it right in the way of morale. Let them start believing in themselves as a team again, the lack of this is what many clubs are paying for unknowingly. Imagine at times, they will sack a coach and the same coach will be doing well elsewhere, so it's not about them.
Also, the introduction of new players is key here, and these players must know their objective, they need to excite the dull team and see if they can bridge the link.
regarding the problems currently being experienced by Chelsea, there is only a lack of understanding between the coach and the players. and in a way if i look more greetings at this Chelsea team need new players.
because I saw several Chelsea players who seemed to be getting bored or lazy to use their strong performance in every game. so it's true that it's a waste to change coaches a few times but Chelsea's players don't have the consistency to have the desire to win any trophies.
I hope that in the new season I want to see Chelsea have some new players who are more effective and have a better performance.