Grid Draw on Top of Data

Is it possible to set grid to be drawn on top of the data?

I have a very dense plot of points and I would like to show the grid lines so the eye can follow the trends.

I tried to use thicker lines (1x). See attached graph.

As well as adjusting the grid thickness, try
ModifyGraph axisOnTop(bottom)=1
for the bottom axis, and similarly for the left axis. This draws the axes and associated grid lines on top of traces.
N.B. Draw on Top of Traces is also a checkbox in the GUI for Modify Axis -> Axis tab