I'd suggest Black Butler, its kinda gory and is kinda mixing in supernatural elements like demons and angels as well as mystery, it's one of my favs, if you can't tell from my profile pic lol. It has 3 seasons, around 8+ OVA's and a Movie, Although i have to warn ya, the anime starts it's own story after a few episodes in the first season all throughout the second season, then in the third season it comes back to the story in the manga. Kinda weird but i'd suggest you read the manga as well as watch the anime, it's like getting a bonus story!
I'd also recommend Kakegurui, it's like those super technical sports anime, but it's all about gambling, its actually super fun to watch, it's like you can learn quite a few tricks from watching it, and the gambles get so intense! Also there are a huge handful of crazy psycho characters that makes things interesting...!
Finally, i'd recommend The Royal Tutor, it's a comedy anime about, well, a royal tutor who has to teach a group of princess who seem like a bunch of dipshits at the beginning. It doesn't have incredible plot or anything like that, it's just a really wholesome teacher/student show, i thoroughly enjoyed it! So, if you feel like watching something funny and wholesome, i'd recommend that.