I love the villain but I feel like he gets used too much and I feel like maybe Superman should have a new nemesis at least for a while I think Ultra Humanite would be a good choice because in the golden age he was superman's nemesis before Luthor and I think it would be a good nod to the classics to have Ultra Humanite return as Superman's foe for a while. I think alternatively a good twist they could go with would be for Lex Luthor to maybe become Ultra Humanite since in the original version Ultra Humanite didn't even know his own true identity.