The Student license limit for nodes or elements for Mechanical applications like Static Structural is 32k.

I think you are on the Teaching license. I don't know what that limit is for Mechanical apps, but you say it is 80k.

Reduce local element size near the areas of high stress gradient to get a better estimate of peak stress. Do this with a Sizing mesh control > Sphere of Influence. You must create a Coordinate System near the areas of high stress gradient before you use this mesh control.

The resolution of the peak stress may be limited by the faceted geometry. If the geometry was smoothed, perhaps that would give a different peak stress.