My dream game to play would probably something along those lines of the Mass Effect trilogy but with the depth of Baldur's Gate 3.
But game to make would be something like the light simulations that we had at the end of the 80s and begin of the 90s (think Microprose or Origin) with a bit of story, characters, light strategy and business management and a dynamic campaign with a persistent battlefield.
And that is also the direction I am trying to go, but in baby steps. Current thoughts are to do some kind of 2D arcade sidescrolling game with planes. Think of Choplifter, Wings of Fury, Luftrausers and the non-3D parts of Wings.