Code Geass & Death Note for starters then it depends on what you're interested in (implying no matter what you like watch those first). There are a lot of "traditional" suggestions too, Fate, One-Punch, Gundam something or Gurren ladrillnuts, .Hack and it's various spinoffs, Sword Art Online and a much better alternative Konosuba, and and some point we'll get to the adult (shenin) ones or borderline hentais like Hellsing, Gantz, Highschool DXD, or Elfin Lied. And you can't forget Shonen adaptions like Fullmetal Alchmist, Attack On Titan, Naruto, or the first major arc of Bleach (no fillers).
Have you hit up any of the post TeamFourStar abridged series? Like BlazingAzureCow's Bleach or you know, TFS's Dragonball Z.