Although we don't have much time on our hands, Chelsea is still undergoing transformation, they just got acquired by a new owner, that brought in a new board and coach. You don't just expect everything to start clicking immediately. We have to give them time, we aren't even half way into the season yet and we're already been cancelled.
It seems true, Chelsea's new owner must give the coach time to make big changes, a short time will not affect any results, because he needs adaptation to combine the strategy and choose the right players to become a stater every match. Replacing the new coach, will not solve the problem in my opinion.
We can still make top 4 as the clubs at those positions aren't that far away, Some few bad runs to them and Chelsea good runs can put us back into the discussion for a top 4 finish. Chelsea winning the champions league this season will also guarantee us a position in the next season competition. Although winning it will be like an unlikely outcome but still isn't impossible.
In my opinion, Chelsea's chances of finishing in the top four this season are very difficult, there are still many improvements to be made by Chelsea, the arrival of Joao Felix and maybe several other players need adaptation, because the Premier League is quite competitive. Graham Potter must be able to combine new players with old players, so that Chelsea can get a win, because if they lose again in the next few matches it will make Chelsea even worse off in standings.
Ranking five or six of the standings is more realistic to achieve Chelsea, because if you look at the Premier League at this time, Tottenham, Manchester United and Newcastle United are competing, so that Chelsea's chances are a little more difficult.