Frank,
My shop is about the same size as yours. My sidewalls are 19' tall. I installed UFO LED lights in my shop. I started off with just 1 so I could see if it was what I wanted, and then installed more afterwards. Mine are roughly 22-24' above the floor, and do a great job. These would be an easy swap for your current lights. I have 4, but will be installing 2 more this winter.
https://www.amazon.com/Hykolity-Dimm.../dp/B07V7FM786