New campaigns and announce it big. For example, a campaign set and focused on Europe and the Napoleonic wars. I think it was the most important conflict in the period that AOE-3 represents.
One week free on steam and on xbox game pass (Even without paying for xbox game pass). Announce it at a major event like gamescom. Show cinematics and real gameplay that explain various aspects such as alliances with natives, mercenaries, unique units, etc.
Show the game really how the game is. People often think that it all comes down to musketeers and cannons, and “free” units with the cards.
Microsoft should take AOE-3 a bit more seriously. In a presentation they “embellished” the game, but the truth was they made it look like an indie game. For someone who sees this for the first time without knowing anything about AOE-3 it makes it look like a ridiculous game, or for another type of public.
Age of Empires 25th Anniversary [EN OC] - YouTube Around minute 22 there is talk of AOE-3.
This doesn’t look much like AOE-3. If the intention is to sell it and expose it, they could make it look a little more epic. They never even mention what the game is really about and what possibilities there are in it.
Please also give credit to AOE-3 when they introduce AOE-3 features into AOE-4. It might also sow curiosity for people who don’t know AOE-3 at all.