Honestly, not much before 1010. I'm fine with the rooftop fight and what it led to, along with the other things between 1004-1008. I also wouldn't elongate or change the fights much, outside of those that barely got anything.
But essentially the arc needed 10 more chapters of fighting in specific places to make me happy:
- No BM interference with Page 1.
-The BMP (rather their elite members) join the main fights, mixing them with the F6 and Calamities
- Usopp/Nami both getting chapters in the 1015-1017 range (more a duo fight) to defeat P1 and Ulti, no direct assistance from BM. Tama still does her fight announcement thing.
- After he cures the Ice Oni virus and gets saved by Sanji, Chopper fights Daifuku 1018/1019
- Jinbe's fight can be the same, just pushed to 1020/1021
- Franky's needed more time, 1022/1023
- Robin's was good, 1024/1025
- Brook instead (after cutting down Black Maria's fodder) continued his fight against Compote or something (assuming she's a 300-400 million bounty monster). 2 chapters; 1026-1027.
- Bepo encounters Snack, fights him for a chapter in uncontrolled Sulong; 1028.
- Before Yamato fights Kaido, she fights Smoothie. Yamato being significantly strong enough to handle Smoothie without transforming would make sense, but her last attack is in hybrid. This leads to the rooftop confrontation with Kaido. 1029-1030.
- Inu and Neko legitimately get a fight sequence chapter together for Peros and Jack. The scenes in the 17 pages switch to both their fights. It would feel rushed but better than what we got; 1031.
At this point, 1032 onwards continues as normal. Basically, you push all the content from 1022 to 1032, and fill in what I mention above in those 10-11 chapters.
-1032/1033: sets up Sanji vs Queen/Zoro vs King, does the same updates for Inu/Neko, Killer, Kid/Law, Raizo, etc
- 1034/1035: Yamato/Kaido
- 1036: Luffy/Kaido clash, Inu/Neko win
- 1037 onwards....you get the point, same exact structure from 1027-1049, which would be 1037-1059. We'd be at the end of the Big Mom fight.
If we got bigger Yonko battles, I wouldn't have minded either so you could give BM and Kaido their awakenings....3-4 more chapters after this max to 1062-1063.
This would have solidified a lot of what I wanted Wano to do, and i would rather have been in Wano for another half year to do it, just so it ends plotlines and gave certain characters more relevance.