Recapturing the magic in sequels and follow-ups

Hey TV buffs! "Joy of Life" Season Two, or (庆余年), is back after a five-year hiatus and it is going big! But, as always, it comes with a bit of off-screen drama. Some fans are not too happy with the new season's content. Why is it that sequels and second seasons often struggle to hit the same high notes? On the show: Heyang, Yushan & Steve Hatherly