A third one? Unfortunately the second got pretty close to catching up with the manga, so it'll be a while before there's enough story for a third season to adapt.
If you haven't seen it, I recommend Vinland Saga for a similarly dark story. Not fantasy, rather, set in medieval times.
For a good fantasy setting, go for Dungeon Meshi. It also has its dark moments, but is overall a lighthearted show. !dungeonmeshi@ani.social
Alternatively, just listen to the Made in Abyss soundtrack on repeat to help with coping.
