It sounds like you tend to like shows with good story lines, and don’t seem to mind older shows/animation as much. Simply based on their story telling, these are probably my 3 favorites.
Monster (2004): The story revolves around Kenzo Tenma, a Japanese surgeon living in Düsseldorf, Germany whose life enters turmoil after getting himself involved with Johan Liebert, one of his former patients, who is revealed to be a dangerous serial killer.
Ergo Proxy (2006): Set in a post-apocalyptic future where humans and AutoReiv androids coexist peacefully until a virus gives the androids self-awareness, causing them to commit a series of murders. Inspector Re-L Mayer is assigned to investigate, discovering a more complicated plot behind it that involves a humanoid species known as “Proxy” who are the subject of secret government experiments.
Fruits Basket (1998, but the 2019 remake is miles better and more complete): This is a beautiful story about trauma, love, guilt, and belonging. Don’t be put off by the typical highschool slice of life trope. This is probably the most wholesome, heartwarming show I have ever watched. I’ve seen it 3 times, and on the most recent rewatch I cried the most. Probably every 1 of 4 episodes. I kept realizing subtle plot details I had never noticed before. It has great rewatch value.
It sounds like you tend to like shows with good story lines, and don’t seem to mind older shows/animation as much. Simply based on their story telling, these are probably my 3 favorites.