There's nothing you can do. Its just a thin layer of paint. The color stays bright on the instep and heel so you can still tell they're Louboutin's. I've heard of people using cats claw (not sure the exact name) where they put a black gummy layer on the bottom but it still covers up the whole front part. Or I've used a non slip pad that covers only the partial front part of the shoe so there is still some red showing.
Simple! Just don't wear them... if the red is that important.
Yeah why hasn't anyone invented see through/clear rubber to use on the bottom of shoes as protection? I don/t like covering up my Lanvin flats but those soles need the protectors or they just wear out completely . . . but the soles are light tan and the protectors are brown black, and I go to the best shoe repair places!!