Please help me, I don’t know where to go

The current areas I have: Blasted steps, ShellWood, Wormways, Bone bottom, The marrow, Deep Docks, Far fields, Greymoor, Sinner’s road and Bellhart.

My problem: I’ve been stuck for hours and don’t know where to go. I know about the existence of under works, and the slab but i can’t find it. Please help.