I haven’t watched much animation since I was a kid outside of occasionally South Park, Family Guy, or the Simpsons, but I haven’t really watched even those in the last few years. Then a year or two ago I watched ATLA and LoK after. I just finished a re-watch and am now on a bit of an animation kick. After those I tried Blue Eye Samurai and Arcane, and both where great. Now I’m watching Legend of Vox Machina and Mighty Nein. So far so good. Oh and of course I’ve been keeping up with Invincible. I guess im looking for more suggestions similar to those, but I can be a bit picky. I thought AoT was good during the first several seasons, but I got lost with the plot and haven’t watched the last few.
Castlevania is also a great animation series. Haven’t seen the new series, but the original one without any additional naming parts was great!
Some older stuff:
Cowboy Bepop is a great anime that doesn’t have a lot of the stereotypical anime stuff.
Fullmetal Alchemist: Brotherhood is a great Anime with a nice & long story as well as action scenes.
Gargoyles is a wonderful American cartoon that doesn’t feel like its for kids, similar to ATLA. It tells a continuous story with its characters and has great characters.