Landscape Layer Blend Not Blending?

Just going to reopen this, it’s starting to get annoying even with smoothing it’s not right.

I have searched far and wide for solutions and I have watched a lot of tutorials and none seem to cover this topic, hopefully someone here might know what’s going on.

I have managed to get it mostly smoothed out, I am just wondering why when other people blend materials “it just works” for them.