I haven't seen WW84 but I know what happens in it based on the leak from from several months back and from spoiler reviews and complaints.
Given that, my advice to Jenkins and WB...as if they care what I think
,
would be:
1) If they're going to set it in the past again, truly consider why setting it in the 40s, 90s, 60s, 70s etc. is relevant to the story they're telling and what it has to do with the challenge that Diana is facing.
In other words, if you're setting it in the 90s, don't just do it to show MC Hammer, Clueless, and Grunge shirts. I enjoy nostalgia as much as the next person, but there needs to be more then that to justify setting the film in a particular time period.
If the film takes place in 1992, truly incorporate why that year in particular is relevant to the story and to Diana's struggle. In 1992, there was racial strife and riots, you had the cold war ending, you had the rise of gang violence , Talk and reality shows were starting etc.
How do all of those things effect Diana's spirit, her world view, her challenge, and her opponent.
Heck if it takes place in 2022, show us why the story needs to take place in 2022.
2) Like WW1, it needs to be Diana's story, with Diana and her challenge as the focus, and the villain should reflect her internal struggle.
3) One villain ,whether it be from the comics or not. One foe.
4) Return to the more balanced tone of the first film which balanced the humor and drama.
5) Give us a modern Patty Jenkins take on WW, not an homage to Donner and Schumacer from the 80s and 90s.