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Well, the problems started originally with Graham Potter. His invitation was probably the key mistake because before Chelsea he had no big clubs and the result was average in Chelsea itself at first, but after the purchase of star players it became even worse. Apparently with the arrival of new stars Potter finally lost control.
The invitation of Lampard was also incomprehensible, because before that he had been sacked just because of poor results.
Graham Potter can't be blamed for Chelsea's slump, but he is responsible for not doing a great job for his team. Chelsea experienced a decline in performance not because of Tuchel, Potter and Lampard, but I think the truest reason was the politicization of the war between Russia and Ukraine which caused Roman Abramovich to sell Chelsea to Todd Boehly.
Poccetino has experience working with the most star players, so at least he shouldn't have a problem with discipline. The main thing is to show results in the beginning to return everyone's confidence that Chelsea are still a top club.
Chelsea have been a top team in the Premier League for a long time, even before Manchester City dominated the Premier League in recent seasons. Chelsea just need time and patience to build on the mentality of a team that is breaking down so I think they are on the right track when they manage to bring in quality players as well as an experienced coach.