Barry could use his super - speed to quickly track down Zoom's lair. Once he locates it, he might try to create a distraction to draw Zoom away from Caitlin, allowing other members of Team Flash, like Cisco or Wells, to sneak in and free her. Cisco could use his powers to open up portals or disable any security measures that Zoom has set up.
Zoom could be kidnapping Caitlin simply out of his twisted sense of power and control. He enjoys causing chaos and fear, and taking someone important to Barry like Caitlin is a way to assert his dominance. Also, in the context of fanfiction, the writer might be exploring a scenario where Zoom has some personal vendetta against Caitlin that was not fully explored in the original series. For example, he could blame her for something that happened in his past, even if it's a misdirected blame.
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.
One of the best reverse flash stories is his origin story. He was a scientist obsessed with speed and became a twisted version of The Flash. His constant battles with The Flash create a lot of intense and action - packed moments.
The Reverse Flash has a rich history in the Flash comics. Some of the top 10 stories include his attempts to rewrite history so that he is the hero and the Flash is the villain. He has also had stories where he manipulates other villains to do his bidding against the Flash. His story of being from the future and coming back to torment the Flash in the present is also quite prominent. There are also tales of his rivalry with other speedsters that he sees as obstacles to his goal of being the only true speedster, and his constant meddling in the Flash's life to prove his superiority is a recurring theme in these stories.