Manchester City succeeded in building a strong foundation, so that they were able to maintain their performance for years, at least they managed to defend the title for 4 consecutive seasons. In my opinion, the foundation they created is one of the keys that has enabled them to be consistent so far, because without that foundation they would probably decline quickly.
We see a lot of teams that only last for 1 season, that's because they don't have a solid foundation so they can decline in a short time. We must not forget the genius of the coach, because Pep Guardiola is indeed a coach who is good at concocting strategies that he can apply well in his game. Manchester City also cannot be separated from their success, because management gave Pep Guardiola a long time.
Thanks to Pep Guardiola, Manchester City can get a strong performance foundation so that they become a team that is really difficult to beat. Pep Guardiola's success has made Manchester City lucky because they have found a coach who is suitable for them so they can win consecutive titles and of course that is a very good achievement. I don't think Manchester City will experience a decline in performance if Pep Guardiola is still with him, of course with Pep Guardiola's guidance.
Pep Guardiola has made a big contribution to Manchester City, because Manchester City, which is coached by Pep Guardiola, has made them lucky because the guidance and direction he gave them succeeded in making Manchester City a strong team. But you need to remember, no coach will stay forever, so when Manchester City is left by him, I don't know if Manchester City will find a suitable coach again so that they can still remain consistent or they will experience a decline in performance.