There are still shortcomings that Guardiola must improve next season, I think their defense line is still not that strong, they need to recruit new players who can guard the back line at Manchester City so that it is much stronger next season, another thing is also Manchester City's front line Don't rely too much on Haaland there, they need players on the front lines who are truly productive and can be goal machines, the competition between the two will definitely be very tight, which is why Guardiola will avenge his failure in the UCL last season. Mbappe's joining will also make things difficult for Manchester City next season unless they also make changes to their main squad.
- Guardiola buy young defenders:
As one of the most favorite coaches will say, defenders win trophies and titles for the club. Any club that has good defense line will definitely do well in a particular season. However, some clubs do not depend too much on their defense because their attackers can be able to score a lot of goals. This was the fate of Liverpool some seasons ago and even Manchester city. When they scored an average of 3 goals every match, it will be difficult for their opponents to equalize.
- Guardiola to sign another world class striker:
You said this will bring competition and improve performance. It is right, but not many world class strikers will want to be a second option.
Even though Mancity has money to buy a good and expensive players, I doubt they will be able to do that, because there is a possibility that Mancity will be punished for breaking financial fair play rules soon.
If there is a good player who wants to join Mancity, it will only be with a 1 year contract or with a clause that they can leave the club if Mancity is relegated, etc.
In fact, many Mancity players want to leave the club after next season, especially after Guardiola is not there.
And I doubt that Mancity will be able to dominate in the Champions League next season, there are too many non-technical issue that will disturb the players and manager concentration in the next season.