Anyone know some good, preferably leftist, anime?
Not a fan of shonen, romance, harem or highschool anime if that helps.
To give you an idea of what I do like. Stuff like Full Metal Alchemist: Brotherhood, Baccano, Lupin the Third, and Miyazaki films are all good and I don't mind comedy if it's bizarre and stupid like Bobobo, or romcom if its wholesome as fuck and is about adults, like Way of the House Husband.
I can't help you with the modern part, but here are some shows I have seen and liked over the years
There's also lots of sports anime, like Hajime No Ippo or Yuri!!! On Ice.
Or you just get into Detective Conan, a murder mystery show, which has over a thousand episodes and 25 movies, including several crossovers with Lupin. There's an overarching story, but the episodes are mostly stand-alone, so you don't have to watch all thousand of them and can just dip in and out however you like. Except for the murders, obviously, it's relatively wholesome and clean. The show is so popular in Japan, it was the only country on earth where Avengers: Endgame didn't make it to #1 in theaters, as one of the Conan movies occupied that spot there.