In that case, perhaps we could create a map based on the landscapes of Dota. Four castles on each side, with three players and one computer opponent per side. The computer opponent has strong defenses, and capturing its castle is the key to victory. Three roads lead from one side to the other, with a diagonal intersection in the center. Add as many resource buildings as possible. However, it will ultimately come down to a few large battles. You could also use reinforcements; for example, place a portal in the dungeon that leads to the computer opponent's castle, position the heroes at different distances from the portal, and place them all in corridors. This would at least create some resemblance.