I don’t know anything about a curse but I heard that in a certain city there were a bunch of bad things happening, like young women miscarrying so the Rosh HaYeshiva said that you need a persons zchus and a great anav and Talmid Chacham moved in and until he was niftar the community didn’t really have any great tragedies.
Maybe you could try to do something like that, counterattack the Rav’s curse.