Yeah, that's a fair point. I haven't yet watched the 3rd season of Made in Abyss. Have been hesitant to do so due to its reputation. ;)
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Hai to Gensou no Grimgar has both manga, and light novels, that stretch on for many more chapters past the anime. The Manga was good and continues on well from the anime. After reaching the end of that I picked up the light novels to continue on further.
Unfortunately (around novel 13 I think?) the author clearly didn't know what to do with the story and it turned silly and boring, so I moved on to other stuff. :(
Somehow I never got into reading manga, probably a good thing too - I checked my MAL stats and I says I have watched 330+ shows and I know I have been lazy and not rating all of them ...
As a quick thought, have you seen Cyberpunk Edgerunners, and Made in Abyss?
For stupid fun (mood dependent), then probably One-Punch Man:
https://en.wikipedia.org/wiki/One-Punch_Man
It's super famous these days, so you've probably already seen it. ;)
Personally, I also really liked "Hai to Gensou no Grimgar" due to its focus on character growth rather than action:
https://en.wikipedia.org/wiki/Grimgar_of_Fantasy_and_Ash
But, not everyone's a fan.