Youtube Patina restoration for cars to get ideas. A wipe down after detailed cleaning with a 50:50 mix of Linseed Oil and Denatured Alcohol can do wonders. But remember that Linseed Oil needs sunlight to dry right. Or you can do a wipe down with Penitrol. Remember it will be a long wait to dry but it will look nice, save your patina, and protect whats left of the finish and even the bare metal.

Personally, I think of paint on my bike as a layer of protection. A nice thick layer of enamel suits me just fine.