What you said about team strategy and the coach is correct for Chelsea Football Club because we can see that the arrival of Graham Potter has proved that Thomas was not actually doing the right thing with Chelsea player. In his first season he had his way, won the Champions League but he did not have the Perfect Blend with the players. Graham Potter is doing it well with the players for a start. It is not the same situation with Liverpool , the coach of Liverpool has been with them even when they did not play well.
So, no strategy actually changed, it is the players that's lost form individually and it is affecting the overall performance of the club .
Knowing all the skills of the players is indeed very difficult and it can be done by Graham Potter is a very good step and hopefully this will be the initial success of Graham Potter's career as a Chelsea coach who can bring Chelsea to be winners of this league, it has been seen that Chelsea have started to gain wins in their last three matches. The toughest opponents for Chelsea are Manchester City and Arsenal who will meet in November and early January 2023.