Even with effectively unlimited resources, all of the games I want to make could easily be done with a small team at most. I've been rotating a Quest 64-like in my mind for over a decade, so I think I would go for that.

The game would take all of my favorite parts of Quest 64, expand them and wrap them around a fully fleshed out story.
- Enemy turns would be more complex with more attacks designed around dodging and the ability to block some damage.
- Casting spells would show their attack area and let you snap targeting to enemies.
- Player turns would have a certain number of action points that can be used for moving, casting or attacking physically, with some actions using fewer points than others.
- Certain spells would be usable outside of battle as a means of traversal, like summoning a rock to create a step up to an otherwise unreachable ledge.
- Has a lower poly style with low-res textures.
- Large maps with a lot to explore, but not really "open world".