All time great are classic cyberpunk-Mecha like serial experiment Lain, ghost in the shell, Evangelion, Akira.
But I watch current seasonal anime. Right now I'm watching.. Goblin Slayer, Dr Stone, Rising of the shield hero, shadow garden and other more slice of life type like Kanojo mo Kanojo, Kimi no koto ga daiski, keikezumi.
You can check out My Anime List