"Writer's Block" hits everyone at some point. When I get a dose of it, I either go back and start editing the project, or I switch to a different story. Having multiple projects going often helps with breaking through "writer's block."
If I changed genres, I'd switch to alternate historical fiction. I have a fascination with the past and I'd love to take the plunge and see what kind of world I could create by changing some small event in the past. I do have a rough set of notes for an alternate history set during the Fourth Crusade where the ruling council of Venice votes to keep Constantinople and other captured Greek cities.