Hi Deb,
A subdiv Level of 3 is actually a lot. I rarely go above level 2…You can probably save some geometry there.
Also, if you haven’t already, use Instances (Linked Duplicates) for the chairs, so ALT+D instead of SHIFT+D:

I wouldn’t worry too much about Poly count for now, let that be one less ‘stress point’. Just don’t go overboard, with so many Triangles, that your computer starts to smoke.