How do you get your credit score to 800?

I consider myself a fiscal conservative and have tried all my life to pay attention to my credit status.

Currently it’s excellent and has been since my 20’s, but without much debt (mortgage and one card really), do you think I need to open more cards? I hate to do that since I would be more likely to use that credit.

Looking for helpful hints on taking it past Excellent to Perfect (800 -850.)