Can’t see the shader setup, it’s too small and partially obscured.
Have you checked normals for the faces that don’t seem to show displacement? Is the object properly UVunwrapped?
If the file isn’t too big, sharing it often leads to better responses.
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Your scale isn’t applied. It’s at 18 in the X and at 0.9 in the Y – so you see nothing happening in the Y.
That’s one of the big 3 things to check first when something goes wrong. Normals, scale, and extraneous geometry.
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This only leaves one question:
How the heck did go through all this and still leave the scale unapplied?
Thanks by the way
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You’re welcome. Oh, that happens surprisingly often, and it’s strangely easier to find in somebody else’s file than one’s own.