Vikings is very good. I've only seen the first four seasons, but my understanding is that the 5th and 6th seasons aren't as good. I'm not sure how much of a history buff you are, but I liked The Man in the High Castle, which just finished last fall. For Netflix, I assume when you say Narcos that you mean both the original and Mexico. I'd add Peaky Blinders, Mindhunter, and The Crown. I haven't seen American Vandal, but that's supposed to be good, though silly and sophomoric. I only saw season 1 of Bloodline, and heard the 2nd and 3rd seasons weren't as good, but the first season is very good and kind of works as a minseries, so you don't really have to keep watching.