IMO, BFA just wasn’t working from the start; I don’t think that there’s really a few things that you can twist to redeem it because there’s just way too much.
Small things I would have preferred?
- Teldrassil being the climax, not the opening.
- No N’zoth; save him for the next expansion and let this be fully focused on the faction war.
- Justify Sylvanas’ aggression, don’t scrap her character entirely and assassinate the entire Horde at the same time.
- At least let the Alliance have a singular moment in which they can break from the trope of being “good guys” and actually get their hands dirty.
All that said, again, I don’t think it’s possible to salvage BFA by adjusting any of its parts; it needs to be totally scrapped. I had my own ideas for what to do instead, which are included in A Proposed Revision 🖊 that I worked up; covers everything from Vanilla to BFA and even some ideas for beyond.
The proposal for BFA there is to make the story focus on Odyn and Helya, and the conflict between life and death as they fight over Azerite, instead of making it a faction conflict story.