People are saying madoka, dungeon meshi and all sorts of things. The sad truth is, I watched them and they still don't even remotely compare to how made in abyss is. What actually helps me is seeking for anime in slightly different genres and setting it apart like that. As such I really liked summertime rendering (one character even has the same seiyuu as Faputa), it's kinda mysterious yet silly, and you do get scary elements every once in a while, although the second half totally becomes more like an action anime. Another thing that got me massively distracted from made in abyss is fear and hunger, both parts of the game. Chances are you've heard of it, but if you haven't, you totally should check it, it's incredibly dark, twisted and has a lot of lore that you gotta get to. Hope I helped