Now the question arises, when will they return to their best form?
Currently City are like toothless lions who are having difficulty beating their opponents, they were not even able to beat Everton, let alone when facing a stronger team in the UCL. If Guardiola is able to improve his squad after taking advantage of the January transfer window, he must focus more on the domestic league to be able to compete again in the top four. I'm not sure City can survive much longer in the UCL, they will definitely lose when facing the favorites.
A very good question, and it will be very difficult to answer, and can only be answered by Manchester City itself.
If you look at the composition of the players they have, most of us would think they will be able to find their best form in a short time, but that is not a guarantee. We can look at their city rivals as a reference for example. In terms of player composition, Manchester United should be able to recover quickly but they need several years for that and even until now they have not been able to recover.
Yes I know they are different, because we cannot equate the process of one team with another team, but at least it can be an illustration that being able to recover is not something easy even though it is not something impossible either.