Grimgar's really good, but it's kinda unique in a way with the blending of fantasy and realism that I don't think other animes have really captured, but if I had to recommend anything similar probably Girl's Last Tour, Mushoku Tensei or maybe a bit of a reach with Made in Abyss.

I don't know kinda hard for me to give an exact recommendation, you could probably check the grimgar reddit or r/anime for reccs.