I know there are lots of information about this on stack exchange!

Data interpolation and ListContourPlot

InterpolationOrder for ContourPlot

Unfortunately I was not able to find a proper way to deal with my issue.

I have a Volumetric data which I read from a gaussian Cube file and I can easily Plot it using ListContourPlot3D but the plot is not smooth and I can not use the InterpolationOrder in ListContourPlot3D. I tried interpolating the data and using SmoothKernelDistribution, This only works for a data [x,y] Dimension not [x,y,z]. Even then it's super slow though I only need to plot the data range of [-0.2,0.2] so probably I can cut some data and speed up.

My volumetric data is at dimensions [40,40,40], it can have some mixed volumetric shapes, as below. I have attached it as a wdx file it's the Transpose[cubedata, {3, 2, 1}, so it what would be plotted and can have shapes as below.