Everyone one of these god damn "Nerf X" threads assumes that the Demigods are each supposed to be able to 1v1 and the more skilled player should usually win. This is silly. Each Demigod has a particular role, not all of them were designed for killing other demigods. Some are support characters, and some are better for doing group damage.
Stop whining because you can't win 1v1 with your favorite Demigod. You aren't supposed to. It all depends on the particular Demigod and the chosen build.
I propose making the Demigods even more specialized.
Make the Support-Demigod characters even more OP in their ability to support other Demigods. In consideration of this, make these characters even less effective than they are now 1v1.
Also, give the AOE nukers SUPER-OP damage, but make them even squishier!