Manchester city and Chelsea are going to be strong this coming season though it wasn't that Chelsea was not strong per say but they were not consistent so that makes them look like they didn't perform well but at least they qualified for Champions league next season. I don't really know what to say about Manchester city but I believe they will do better this coming season and as for Manchester united, if they don't sign new players they will still suffer same thing next season unless Ruben Amorim will change the team entirely and that will take him a lot of time.
It can be hoped that Man City and Chelsea will get better in the next season. Because I think Man City has also shown us their quality through the ongoing Club World Cup. So I have no doubt that Man City will have a better season next season. Likewise Chelsea. Because I see that the new players they have brought in seem quite reliable. And even impressed many people. But other teams are also trying to improve their strength. So nothing will be easy at all for everyone. And the fierce season is coming again.
And about Man United I think they are trying hard in the transfer market to get a lot of good players. Amorim is really changing the Man United squad from square one again. because I saw that several previous lists of Man United's mainstay players were also on the list to be released.