Make points more linear I'm beginner on Blender and I don't find how make points more linear like that red line (We can see points up and down the line) :

Goal is not to make a beautiful render, but a beautiful 3D print.
I know I can set them at the good place one by one but there is a function to help to do that?
I've try the &quot;Smooth&quot; tool (Cube 2x2x2 icon) but the result isn't very good
3D View :
One option could be to go to sculpting mode and use Flatten  tool.

A little silly to not suggest the smooth  tool first: