I expect multi level, vertical building. PhantasiaLand does that kind off well but they work from an existing park. If you build something new it could even be more intricate. I think the development of Nintendo World (an evolution from Diagon Alley) triggered the creative juices. In the end this will make the footprint smaller but adds entertainment value. It also helps creating shade, kinetic movement in the lands, sound barriers and ugly view lines from silly high carnival rides on Idrive.
I have been frustrated by Diagon Alley and all the empty space in the higher levels of the buildings that is unused (or doesn't exist but could have been build). What if you could actually sit and eat your ice cream at Florean Fortescue on the first floor watching the people below? Why not an upper level in Carkit to view the shows from with a nice beer.
What if there actually was a restaurant in Hogwarts at the top of the ride building instead of an empty shell. A magical elevator/floo powder fireplace to bring you to the top. No needs for real windows because of projections but it could add a whole restaurant on top of a ride if you add that to your design. The extra building costs will be offset by more space for hotel rooms, an extra boutique park etc.