Many times new arrivals change the fate of a team because they don't find much affinity with each other, but I have to say that there are many players who, once in the team, manage to do very well and have fun and make others have fun and play well with their teammates too, so it's not a given that they don't get along well with each other.
Every season team makes changes by acquiring players they need, and Chelsea has done the same, like many other teams, but these changes don't immediately translate into significant results. Chelsea has a very large squad because the previous season brought in players who were generally quite young, so the team hasn't been able to give their best in terms of quality and experience.
This season will be a big challenge for Chelsea in competing for the title. Although it will be difficult with many challenges to overcome, there is hope due to the changes made by management. At least, even if they don't win the title, the competition this season can be much more competitive, with the hope that Chelsea can keep up with the other teams.