Indeed, Black Flash was the one to defeat Savitar. The battle was full of action and unexpected twists, but in the end, Black Flash emerged victorious.
The way Flash defeats Savitar in comics involves a lot of factors. He figures out Savitar's patterns, discovers a hidden flaw in his powers, and then strikes at the right time with maximum speed and precision.
One idea could be that the Reverse Flash somehow gets transported to the world of Percy Jackson. He might try to use his speed powers to steal some powerful magical artifacts. The Flash, being the hero, follows him and has to team up with Percy Jackson to stop Reverse Flash. Percy could use his water powers to slow down Reverse Flash while The Flash tries to outrun and capture him.
One of the best reverse flash stories could be the one where he tries to rewrite history in the most devious ways. He goes back in time to mess with Barry Allen's life, like causing his mother's death which sets off a chain of tragic events for Barry. This creates a complex and dark narrative that makes for a great reverse flash story.