My suggestion is to fully focus on WoW Classic and the original Azeroth instead of constantly expanding into new worlds.
Bring every part of Azeroth back to life by making each zone feel active and meaningful. Add dynamic world events, new world bosses, fresh questlines, unique loot, and new gear to every region. Every zone should have reasons for players to return regularly.
I would also love to see many new playable classes added over time. Don’t be afraid to expand the class roster while keeping the Classic RPG feeling intact.
The overall direction should stay much closer to Warcraft III and Warcraft III: The Frozen Throne in terms of atmosphere, storytelling, and world design. That style is one of the biggest reasons many players fell in love with Warcraft.
To attract as many players as possible, I believe all WoW Classic versions should become free-to-play, with monetization focused on cosmetics and optional services
PvP should also receive much more attention:
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Add more Battlegrounds.
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Introduce Arenas to Classic.
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Support Solo Queue, 2v2, 3v3, and 5v5 brackets.
Finally, improve the graphics while preserving the original Warcraft art style. The game should look more modern without becoming overly cartoonish like Retail WoW. The goal should be a cleaner, more immersive version of Classic rather than a complete visual redesign.
Keep it simple. Focus on Azeroth. Expand the world instead of replacing it. I believe this approach would bring back many veteran players while also attracting a new generation of fans.