Agree, haven't seen anyone success with Chelsea in FM23 (i don't count the "holiday-through-a-whole-season-fake-tactics")
In pre-season the team play fantastic with the tactic you setup but when the season starts everything is gone! Nothing works and you get trashed by almost every team you are up against. (lucky to get a draw)
I stopped playing the game before X-mas, no fun, no good and hope the 2024 version is better.
Keep on trying and keep up your good work