 If you liked Shiki |  ...then you might like Tokyo Ghoul √A |
Both these wonders of art are the epitome of top-tier horror in anime, with stark and poignant cautionary tales to boot. Whilst both cover segregation, social anxiety and racism, shiki is more focused on the generational gap.
They're both like human vs monster kind of shows and both get pretty bloody at times, Shiki is A LOT slower though while Tokyo Ghoul is pretty fast paced, the main characters (Natsuno and Kaneki) are quite similar too, on the human's side even though they aren't exactly human