That terminal level of saltiness on Zerban's part is the reason why RoA's OP has me recommend F/HF while simultaneously saying I don't like the guy. While tagging him. He's hilariously passive aggressive.
Okay, don't know if this will help, but perhaps you could try writing from another perspective? I mean, so far you've written from Dio's POV, perhaps writing from either Kotomine, Sakura, Jotaro, or even Jolyne's POV will get you out of your writer's block.
When you don't know what to write for a character it sometimes helps to try writing for another.