I am sorry to hear that tbh. The only instance I blocked was lemmynsfw (altho not the users) because porn kept flooding my screen whenever I would attempt to browse for new communities. I also blocked a buttload of lemmygrad.ml communities before I had the ability to block instances, but I’m not sure if my instance even federates with them anyway. For users, I only ever ended up blocked one person evidently according to my account info.