the Manchester City team was built with process and now they are very solidly formed, it is possible for this team to continue to be in good form in the next 5 years or more.
and I'm sure that if Pep Guardiola stays at Manchester City in the next few seasons, they will be able to win many titles.
They actually dominated Premier League in the last six seasons but many players who experienced those successful years with them might leave Etihad in this summer. Winning Champions League is a greatest achievement they wanted to gain with Manchester City and now they had it. Players like Gundogan, Silva are open to move and some players like Laporte, Cancelo will not want to stay too. They want to play more often because Euro 2024 will come soon.
Manchester City are rich and Pep is a genius coach but sometimes, you can not get good replacements just by spending money and buying new players. Klopp and Liverpool are examples when their trio Salah-Firmino-Mane broken, they got more problems in attacking.
The Premier League has very tight competition from other teams, therefore teams are required to continue to develop much better.
currently the most competitive league is the Premier League even though man CIty has dominated in the last few seasons but that is inseparable from the strength and consistency of this team which is very good.
Next season, Manchester City will get more difficulty to protect their crown in Premier League because logically Arsenal would become stronger, same for Newcastle United. Manchester United, Chelsea can get improvement in the summer too.