I tried to reduce the polys but it keeps failing. Would it be a better idea to shrink all the polys in blender first and then put it in?

You can certainly try that, but my hunch is you'll have to give up on this item.

Reducing polys is tough -- even dedicated programs (like Decimator for Daz) have problems with very high counts.  And I've never gotten satisfactory results in Blender.  But it's always worth a try.

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Alienware Aurora R16, Win 11, i9-149000KF, 3.20GHz CPU, 64GB RAM, RTX 4090 (24GB), Samsung 870 Pro 8TB, Gen3 MVNe M-2 SSD, 4TBx2, 39" Alienware Widescreen Monitor
Mike "ex-genius" Kelley

Would boosting any specs help with the process or is it the program?

Try reducing a single item at a time, instead of all at once then. You'll find the button for it in the Modify panel. Look for "Polygon Reduction Object"