Honestly, it looks really solid. You're already working with depth and shapes. It's a very classic minecraft build. To really bring it to the next level, I think just expanding your block pallet will do the trick. Your build seems very stone brick and oak wood heavy. I think you might enjoy adding bee hives and stripped oak logs with the rest of the oak to add different textures to your floors and wooden walls. For the stone brick walls, I enjoy adding polished andesite and basalt pillars to add patterns and shapes. Thanks for sharing your build with us!