I feel like every episode since S3 is rushed. I would have extend episodes length to 25-30 minute. 20 minute is just too short for more developed episodes.
If I cannot have the time extended, then I increase the number of 2/3/4-parters to better develop elements.
2nd: Make TexasUberAlles the story editor, because he has a good grasp on what’s what, and would keep things in line with the lore and story developments.
3rd: Consequentialism, and lots of it. If there’s one thing RR shows us, it’s that the consequences of previous actions can both matter, and lead to interesting new developments and directions regarding the characters, story, and setting.
4th: Make the narrative organic. This is related to the above, in that changes actually matter. It doesn’t have to be serialised, but if something of consequence happens, then it should stick, with the characters, setting, and story reacting to it in a logical, believable fashion.
5th: Kick Twilight upstairs, and bring in Sunset Shimmer. Twilight’s story is essentially done in my mind, thus make her a secondary character. Bring SS in to replace her.
6th: Flesh out the setting, and make places like the Crystal Empire feel different, instead of just looking different. Give them their own unique quirks, cultures, and feels, so to expand the breath of the setting.