Googly eyes solve that. Beam me up Scotty, no aesthetics here
There's little low-hanging fruit left for aero improvements on a 2020 Prius...
Maybe a small air dam or front splitter like lip.
Just do the other stuff. Remove weight and air up the tires, nobody sees that and it helps a couple of %.
Paint it black with white doors and JAPD in big golden letters (for Just A Prius Driver) so you can drive as slow as you like without getting bothered. Oh, aesthetics?
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2011 Honda Insight + HID, LEDs, tiny PV panel, extra brake pad return springs, neutral wheel alignment, 44/42 PSI (air), PHEV light (inop), tightened wheel nut.
lifetime FE over 0.2 Gmeter or 0.13 Mmile.
For confirmation go to people just like you.
For education go to people unlike yourself.