Not simply to plug my own crap, but you might wanna check this out: Idea for a Better BFA Narrative.
It was my take on how to redo BFA; the gist of it was that Thoras Trollbane leaves the Ebon Blade to rebuild his kingdom, and Danath is stuck down in Stormwind advising Anduin still. Sylvanas -still- wants Stromgarde and Arathi after the whole Galen debacle, and she starts putting heat on Arathi.
The player is sent by Danath to convince Thoras to send an official summons for aid, but he’s too stubborn, and so you gotta get creative and pull some “beacons of Minas Tirith” level stuff to officially send word for the Alliance to ride north.
Both factions fight over Arathi (and consider it contested ground) and we start the expansion with the Arathi Warfront.
In response, Sylvanas and Anduin know it could get worse, so Sylvanas invites the Alliance leaders to Lordaeron for a peace summit, and tries to assassinate them, believing she can cripple the Alliance by doing so and pre-emptively end the war, killing Malfurion in the process, but the rest escape - and that prompts the siege of Lordaeron, in which Nathanos or some other Horde leader dies.
Sylvanas responds by attacking Teldrassil after the fall of Lordaeron, and manages to capture it, and we get the Darkshore battlefront in the process.
The second raid of the expansion would be Tyrande disobeying Anduin, along with Genn, in an effort to reclaim Teldrassil and free her people. The twist is that Anduin needs those forces to attack Dazar’alor, and so it leaves him short handed in the future when we raid Dazar’alor.
Genn and Tyrande stage an assault on Darnassus, and both player sides have to fight the enemy faction in the streets of the city, leading to a final show down between Sylvanas and Tyrande, which ignites a fire, which burns the whole tree down.
Most of the civilians die, and both sides blame each other, even though it’s not directly one side’s fault or the other’s.
It gives justification for some night elves to wanna be raised as Forsaken to get revenge on Tyrande, and it gives the rest of the night elves justification to absolutely hate the Forsaken.
Both sides win by everybody losing. Both factions have cities raided, both factions lose a city, and both sides lose a faction leader.
It also sets up a more contentious plot within the Alliance, and takes the Horde out of the villain spotlight, and seems more like natural escalation of war, and things getting out of hand.